diff --git a/backend/controllers/adminController.js b/backend/controllers/adminController.js
index 636bf44..7ac8974 100644
--- a/backend/controllers/adminController.js
+++ b/backend/controllers/adminController.js
@@ -34,6 +34,7 @@ class AdminController {
         this.getUsers = this.getUsers.bind(this);
         this.updateUser = this.updateUser.bind(this);
         this.resetUserVocabLessonProgress = this.resetUserVocabLessonProgress.bind(this);
+        this.markUserVocabLessonsCompleteThrough = this.markUserVocabLessonsCompleteThrough.bind(this);
         this.getUserVocabCourses = this.getUserVocabCourses.bind(this);
         this.getVocabCourseForAdmin = this.getVocabCourseForAdmin.bind(this);
         this.getAdultVerificationRequests = this.getAdultVerificationRequests.bind(this);
@@ -151,6 +152,34 @@ class AdminController {
         }
     }
 
+    async markUserVocabLessonsCompleteThrough(req, res) {
+        const schema = Joi.object({
+            courseId: Joi.number().integer().positive().required(),
+            throughLessonNumber: Joi.number().integer().positive().required()
+        });
+        const { error, value } = schema.validate(req.body || {});
+        if (error) {
+            return res.status(400).json({ error: error.details[0].message });
+        }
+        try {
+            const { userid: requester } = req.headers;
+            const { id } = req.params;
+            const result = await AdminService.adminMarkUserVocabLessonsCompleteThrough(
+                requester,
+                id,
+                value.courseId,
+                value.throughLessonNumber
+            );
+            res.status(200).json(result);
+        } catch (err) {
+            let status = 500;
+            if (err.message === 'noaccess') status = 403;
+            else if (err.message === 'notenrolled') status = 403;
+            else if (err.message === 'badrequest') status = 400;
+            res.status(status).json({ error: err.message });
+        }
+    }
+
     async getUserVocabCourses(req, res) {
         try {
             const { userid: requester } = req.headers;
diff --git a/backend/routers/adminRouter.js b/backend/routers/adminRouter.js
index 4038679..80a5dd2 100644
--- a/backend/routers/adminRouter.js
+++ b/backend/routers/adminRouter.js
@@ -27,6 +27,11 @@ router.get('/users/erotic-moderation/preview/:type/:targetId', authenticate, adm
 router.put('/users/erotic-moderation/:id', authenticate, adminController.applyEroticModerationAction);
 router.get('/users/:id/vocab-courses', authenticate, adminController.getUserVocabCourses);
 router.post('/users/:id/vocab-lesson-progress/reset', authenticate, adminController.resetUserVocabLessonProgress);
+router.post(
+    '/users/:id/vocab-lesson-progress/mark-complete-through',
+    authenticate,
+    adminController.markUserVocabLessonsCompleteThrough
+);
 router.get('/vocab/courses/:courseId', authenticate, adminController.getVocabCourseForAdmin);
 router.get('/users/:id', authenticate, adminController.getUser);
 router.put('/users/:id', authenticate, adminController.updateUser);
diff --git a/backend/services/adminService.js b/backend/services/adminService.js
index 4fa64c1..129c7b6 100644
--- a/backend/services/adminService.js
+++ b/backend/services/adminService.js
@@ -1974,6 +1974,28 @@ class AdminService {
         }
     }
 
+    async adminMarkUserVocabLessonsCompleteThrough(requesterHashedId, targetHashedId, courseId, throughLessonNumber) {
+        if (!(await this.hasUserAccess(requesterHashedId, 'useradministration'))) {
+            throw new Error('noaccess');
+        }
+        const vocab = new VocabService();
+        try {
+            return await vocab.adminMarkLessonsCompleteThrough(
+                targetHashedId,
+                Number(courseId),
+                Number(throughLessonNumber)
+            );
+        } catch (e) {
+            if (e.status === 403) {
+                throw new Error('notenrolled');
+            }
+            if (e.status === 400) {
+                throw new Error('badrequest');
+            }
+            throw e;
+        }
+    }
+
     async adminListUserEnrolledVocabCourses(requesterHashedId, targetHashedId) {
         if (!(await this.hasUserAccess(requesterHashedId, 'useradministration'))) {
             throw new Error('noaccess');
diff --git a/backend/services/vocabService.js b/backend/services/vocabService.js
index 9299b80..db74357 100644
--- a/backend/services/vocabService.js
+++ b/backend/services/vocabService.js
@@ -2609,6 +2609,101 @@ export default class VocabService {
     return this._purgeLessonProgressForUser(user.id, lesson.id);
   }
 
+  /**
+   * Admin: Alle Lektionen eines Kurses bis einschließlich lesson_number als abgeschlossen setzen
+   * (nur Zeilen, die noch nicht completed sind). Nur bei eingeschriebenem Nutzer.
+   */
+  async adminMarkLessonsCompleteThrough(targetHashedUserId, courseId, throughLessonNumber) {
+    const user = await this._getUserByHashedId(targetHashedUserId);
+    const cid = Number(courseId);
+    const maxNum = Number(throughLessonNumber);
+    if (!Number.isFinite(cid) || cid < 1) {
+      const err = new Error('Invalid courseId');
+      err.status = 400;
+      throw err;
+    }
+    if (!Number.isFinite(maxNum) || maxNum < 1) {
+      const err = new Error('Invalid throughLessonNumber');
+      err.status = 400;
+      throw err;
+    }
+
+    const enrollment = await VocabCourseEnrollment.findOne({
+      where: { userId: user.id, courseId: cid }
+    });
+    if (!enrollment) {
+      const err = new Error('Not enrolled in this course');
+      err.status = 403;
+      throw err;
+    }
+
+    const lessons = await VocabCourseLesson.findAll({
+      where: { courseId: cid, lessonNumber: { [Op.lte]: maxNum } },
+      order: [['lessonNumber', 'ASC']]
+    });
+
+    const now = new Date();
+    const details = [];
+
+    for (const lesson of lessons) {
+      const lessonData = lesson.get({ plain: true });
+      const targetScore = lessonData.targetScorePercent || 80;
+
+      const [progress] = await VocabCourseProgress.findOrCreate({
+        where: { userId: user.id, lessonId: lesson.id },
+        defaults: {
+          userId: user.id,
+          courseId: cid,
+          lessonId: lesson.id,
+          completed: false,
+          score: 0,
+          lessonState: {}
+        }
+      });
+
+      if (progress.completed) {
+        details.push({
+          lessonNumber: lesson.lessonNumber,
+          lessonId: lesson.id,
+          status: 'unchanged'
+        });
+        continue;
+      }
+
+      const mergedState = this._applyScheduledReviewState(
+        this._sanitizeLessonState(progress.lessonState),
+        {
+          previousCompleted: false,
+          nextCompleted: true,
+          shouldAdvanceReview: true,
+          lessonData,
+          now
+        }
+      );
+
+      await progress.update({
+        completed: true,
+        completedAt: now,
+        score: Math.max(Number(progress.score) || 0, targetScore),
+        lastAccessedAt: now,
+        lessonState: mergedState
+      });
+
+      details.push({
+        lessonNumber: lesson.lessonNumber,
+        lessonId: lesson.id,
+        status: 'marked_complete'
+      });
+    }
+
+    return {
+      courseId: cid,
+      throughLessonNumber: maxNum,
+      lessonsConsidered: lessons.length,
+      details
+    };
+  }
+
   // ========== GRAMMAR EXERCISE METHODS ==========
 
   async getExerciseTypes() {
diff --git a/frontend/src/i18n/locales/ceb/admin.json b/frontend/src/i18n/locales/ceb/admin.json
index b739c0e..6a57e72 100644
--- a/frontend/src/i18n/locales/ceb/admin.json
+++ b/frontend/src/i18n/locales/ceb/admin.json
@@ -36,6 +36,16 @@
       "loadCoursesError": "Dili makarga ang lista sa mga kurso.",
       "loadingLessons": "Nagkarga sa mga leksiyon …"
     },
+    "vocabLessonMarkComplete": {
+      "divider": "Ayuhon ang pag-uswag (dili paghimo og peke nga resulta sa ehersisyo)",
+      "throughLabel": "Tanang leksiyon hangtod sa numero (lakip)",
+      "hint": "I-mark ang kulang o abli nga mga row nga nahuman, lakip ang target score ug unang review wave. Ang nahuman na dili usbon.",
+      "submit": "I-mark nga nahuman hangtod dinhi",
+      "confirm": "I-mark nga nahuman ang tanang leksiyon nga numero ≤ {n} ni {username} niining kurso?",
+      "success": "{marked} ka leksiyon nga bag-ong gi-mark nga nahuman ({unchanged} klaro nang nahuman).",
+      "successNone": "Walay pagbag-o: tanang leksiyon nga naapektuhan ({unchanged}) klaro nang nahuman.",
+      "error": "Dili ma-mark nga nahuman."
+    },
     "rights": {
       "add": "Idugang ang katungod",
       "select": "Palihog pagpili",
diff --git a/frontend/src/i18n/locales/de/admin.json b/frontend/src/i18n/locales/de/admin.json
index a3b251b..e648295 100644
--- a/frontend/src/i18n/locales/de/admin.json
+++ b/frontend/src/i18n/locales/de/admin.json
@@ -45,6 +45,16 @@
             "loadCoursesError": "Die Kursliste konnte nicht geladen werden.",
             "loadingLessons": "Lektionen werden geladen …"
         },
+        "vocabLessonMarkComplete": {
+            "divider": "Fortschritt reparieren (ohne Übungsergebnisse zu fälschen)",
+            "throughLabel": "Alle Lektionen bis Lektionsnummer (einschließlich)",
+            "hint": "Setzt fehlende oder offene Einträge auf „abgeschlossen“, inkl. Ziel-Score und erster Review-Welle. Bereits abgeschlossene Lektionen bleiben unverändert.",
+            "submit": "Bis hier als abgeschlossen markieren",
+            "confirm": "Alle Lektionen mit Nummer ≤ {n} für {username} in diesem Kurs als abgeschlossen markieren?",
+            "success": "{marked} Lektion(en) neu als abgeschlossen gesetzt ({unchanged} waren bereits erledigt).",
+            "successNone": "Keine Änderung: alle betroffenen Lektionen ({unchanged}) waren bereits abgeschlossen.",
+            "error": "Markieren fehlgeschlagen."
+        },
         "adultVerification": {
             "title": "[Admin] - Erotik-Freigaben",
             "intro": "Volljährige Nutzer können den Erotikbereich beantragen. Hier werden Anfragen geprüft und freigegeben oder abgelehnt.",
diff --git a/frontend/src/i18n/locales/en/admin.json b/frontend/src/i18n/locales/en/admin.json
index ac2bf2f..205721e 100644
--- a/frontend/src/i18n/locales/en/admin.json
+++ b/frontend/src/i18n/locales/en/admin.json
@@ -45,6 +45,16 @@
             "loadCoursesError": "Could not load the course list.",
             "loadingLessons": "Loading lessons…"
         },
+        "vocabLessonMarkComplete": {
+            "divider": "Repair progress (does not fabricate exercise answers)",
+            "throughLabel": "All lessons up to and including lesson number",
+            "hint": "Marks missing or open rows as completed, including target score and first review wave. Already completed lessons are left unchanged.",
+            "submit": "Mark through here as completed",
+            "confirm": "Mark every lesson with number ≤ {n} for {username} in this course as completed?",
+            "success": "{marked} lesson(s) newly marked complete ({unchanged} were already done).",
+            "successNone": "No change: all affected lessons ({unchanged}) were already completed.",
+            "error": "Could not mark lessons complete."
+        },
         "adultVerification": {
             "title": "[Admin] - Erotic approvals",
             "intro": "Adult users can request access to the erotic area. Requests can be reviewed, approved or rejected here.",
diff --git a/frontend/src/i18n/locales/es/admin.json b/frontend/src/i18n/locales/es/admin.json
index f81bf04..c6761fe 100644
--- a/frontend/src/i18n/locales/es/admin.json
+++ b/frontend/src/i18n/locales/es/admin.json
@@ -45,6 +45,16 @@
             "loadCoursesError": "No se pudo cargar la lista de cursos.",
             "loadingLessons": "Cargando lecciones…"
         },
+        "vocabLessonMarkComplete": {
+            "divider": "Reparar progreso (no inventa resultados de ejercicios)",
+            "throughLabel": "Todas las lecciones hasta el número (incluido)",
+            "hint": "Marca filas faltantes o abiertas como completadas, con puntuación objetivo y primera ola de repaso. Las ya completadas no se cambian.",
+            "submit": "Marcar hasta aquí como completadas",
+            "confirm": "¿Marcar todas las lecciones con número ≤ {n} para {username} en este curso como completadas?",
+            "success": "{marked} lección(es) marcadas como completadas ({unchanged} ya estaban hechas).",
+            "successNone": "Sin cambios: todas las lecciones afectadas ({unchanged}) ya estaban completadas.",
+            "error": "No se pudo marcar como completadas."
+        },
         "adultVerification": {
             "title": "[Admin] - Aprobaciones eróticas",
             "intro": "Los usuarios adultos pueden solicitar acceso al área erótica. Aquí se revisan, aprueban o rechazan las solicitudes.",
diff --git a/frontend/src/views/admin/UsersView.vue b/frontend/src/views/admin/UsersView.vue
index ec06409..8b48632 100644
--- a/frontend/src/views/admin/UsersView.vue
+++ b/frontend/src/views/admin/UsersView.vue
@@ -82,6 +82,31 @@
           {{ vocabResetSubmitting ? $t('general.loading') : $t('admin.vocabLessonReset.reset') }}
         </button>
       </div>
+
+      <template v-if="vocabCourseLessons.length">
+        <p class="vocab-reset__divider">{{ $t('admin.vocabLessonMarkComplete.divider') }}</p>
+        <label class="edit__field">
+          <span>{{ $t('admin.vocabLessonMarkComplete.throughLabel') }}</span>
+          <input
+            v-model.number="vocabMarkThroughNumber"
+            type="number"
+            min="1"
+            :max="vocabMaxLessonNumber"
+            :disabled="loadingVocabCourseDetail || vocabMarkSubmitting"
+            class="vocab-reset__number"
+          />
+        </label>
+        <p class="vocab-reset__hint">{{ $t('admin.vocabLessonMarkComplete.hint') }}</p>
+        <div class="vocab-reset__row">
+          <button
+            type="button"
+            :disabled="!canMarkVocabThrough || vocabMarkSubmitting || loadingVocabCourseDetail"
+            @click="adminMarkVocabLessonsThrough"
+          >
+            {{ vocabMarkSubmitting ? $t('general.loading') : $t('admin.vocabLessonMarkComplete.submit') }}
+          </button>
+        </div>
+      </template>
     </section>
   </div>
 </template>
@@ -105,6 +130,8 @@ export default {
       loadingVocabCourses: false,
       loadingVocabCourseDetail: false,
       vocabResetSubmitting: false,
+      vocabMarkThroughNumber: null,
+      vocabMarkSubmitting: false,
       vocabLoadError: false
     };
   },
@@ -125,6 +152,15 @@ export default {
           selectLabel: dup ? `${c.title} (#${c.id})` : (c.title || `#${c.id}`)
         };
       });
+    },
+    vocabMaxLessonNumber() {
+      const list = this.vocabCourseLessons;
+      if (!list.length) return 1;
+      return Math.max(...list.map((l) => Number(l.lessonNumber) || 0));
+    },
+    canMarkVocabThrough() {
+      const n = Number(this.vocabMarkThroughNumber);
+      return Number.isFinite(n) && n >= 1 && n <= this.vocabMaxLessonNumber;
     }
   },
   methods: {
@@ -135,6 +171,7 @@ export default {
       this.selectedVocabCourseId = '';
       this.vocabCourseLessons = [];
       this.selectedVocabLessonId = '';
+      this.vocabMarkThroughNumber = null;
     },
     async select(u) {
       const res = await apiClient.get(`/api/admin/users/${u.id}`);
@@ -168,6 +205,7 @@ export default {
         this.selectedVocabCourseId = '';
         this.vocabCourseLessons = [];
         this.selectedVocabLessonId = '';
+        this.vocabMarkThroughNumber = null;
       } catch (e) {
         console.error('[UsersView] vocab courses:', e);
         this.vocabCourses = [];
@@ -179,6 +217,7 @@ export default {
     },
     async onVocabCourseChange() {
       this.selectedVocabLessonId = '';
+      this.vocabMarkThroughNumber = null;
       this.vocabCourseLessons = [];
       if (!this.selectedVocabCourseId) {
         return;
@@ -232,6 +271,45 @@ export default {
       } finally {
         this.vocabResetSubmitting = false;
       }
+    },
+    adminMarkVocabLessonsThrough() {
+      if (!this.selected || !this.selectedVocabCourseId || !this.canMarkVocabThrough || this.vocabMarkSubmitting) {
+        return;
+      }
+      const n = Number(this.vocabMarkThroughNumber);
+      const msg = this.$t('admin.vocabLessonMarkComplete.confirm', {
+        n,
+        username: this.selected.username
+      });
+      if (!window.confirm(msg)) {
+        return;
+      }
+      this.runAdminVocabMarkThrough();
+    },
+    async runAdminVocabMarkThrough() {
+      this.vocabMarkSubmitting = true;
+      try {
+        const { data } = await apiClient.post(
+          `/api/admin/users/${this.selected.id}/vocab-lesson-progress/mark-complete-through`,
+          {
+            courseId: Number(this.selectedVocabCourseId),
+            throughLessonNumber: Number(this.vocabMarkThroughNumber)
+          }
+        );
+        const details = Array.isArray(data?.details) ? data.details : [];
+        const marked = details.filter((d) => d.status === 'marked_complete').length;
+        const unchanged = details.filter((d) => d.status === 'unchanged').length;
+        const msgKey =
+          marked === 0 && unchanged > 0
+            ? 'admin.vocabLessonMarkComplete.successNone'
+            : 'admin.vocabLessonMarkComplete.success';
+        this.$root?.$refs?.messageDialog?.open?.(this.$t(msgKey, { marked, unchanged }));
+      } catch (e) {
+        console.error('[UsersView] admin vocab mark complete:', e);
+        this.$root?.$refs?.messageDialog?.open?.(this.$t('admin.vocabLessonMarkComplete.error'));
+      } finally {
+        this.vocabMarkSubmitting = false;
+      }
     }
   }
 };
@@ -303,6 +381,18 @@ export default {
   line-height: 1.45;
 }
 
+.vocab-reset__divider {
+  margin: 8px 0 0;
+  padding-top: 14px;
+  border-top: 1px dashed var(--color-border);
+  color: var(--color-text-secondary);
+  font-size: 0.88rem;
+}
+
+.vocab-reset__number {
+  max-width: 120px;
+}
+
 .vocab-reset__row {
   display: flex;
   flex-wrap: wrap;