diff --git a/backend/src/app.module.ts b/backend/src/app.module.ts
index 0197cd2..ce8dbc2 100644
--- a/backend/src/app.module.ts
+++ b/backend/src/app.module.ts
@@ -17,6 +17,7 @@ import { EnfantsModule } from './routes/enfants/enfants.module';
 import { AppConfigModule } from './modules/config/config.module';
 import { DocumentsLegauxModule } from './modules/documents-legaux';
 import { RelaisModule } from './routes/relais/relais.module';
+import { DossiersModule } from './routes/dossiers/dossiers.module';
 
 @Module({
   imports: [
@@ -55,6 +56,7 @@ import { RelaisModule } from './routes/relais/relais.module';
     AppConfigModule,
     DocumentsLegauxModule,
     RelaisModule,
+    DossiersModule,
   ],
   controllers: [AppController],
   providers: [
diff --git a/backend/src/routes/dossiers/dossiers.controller.ts b/backend/src/routes/dossiers/dossiers.controller.ts
new file mode 100644
index 0000000..2f3f677
--- /dev/null
+++ b/backend/src/routes/dossiers/dossiers.controller.ts
@@ -0,0 +1,26 @@
+import { Controller, Get, Param, UseGuards } from '@nestjs/common';
+import { ApiOperation, ApiParam, ApiResponse, ApiTags } from '@nestjs/swagger';
+import { Roles } from 'src/common/decorators/roles.decorator';
+import { RoleType } from 'src/entities/users.entity';
+import { AuthGuard } from 'src/common/guards/auth.guard';
+import { RolesGuard } from 'src/common/guards/roles.guard';
+import { DossiersService } from './dossiers.service';
+import { DossierUnifieDto } from './dto/dossier-unifie.dto';
+
+@ApiTags('Dossiers')
+@Controller('dossiers')
+@UseGuards(AuthGuard, RolesGuard)
+export class DossiersController {
+  constructor(private readonly dossiersService: DossiersService) {}
+
+  @Get(':numeroDossier')
+  @Roles(RoleType.SUPER_ADMIN, RoleType.ADMINISTRATEUR, RoleType.GESTIONNAIRE)
+  @ApiOperation({ summary: 'Dossier complet par numéro (AM ou famille) – Ticket #119' })
+  @ApiParam({ name: 'numeroDossier', description: 'Numéro de dossier (ex: 2026-000001)' })
+  @ApiResponse({ status: 200, description: 'Dossier famille ou AM', type: DossierUnifieDto })
+  @ApiResponse({ status: 404, description: 'Aucun dossier pour ce numéro' })
+  @ApiResponse({ status: 403, description: 'Accès refusé' })
+  getDossier(@Param('numeroDossier') numeroDossier: string): Promise<DossierUnifieDto> {
+    return this.dossiersService.getDossierByNumero(numeroDossier);
+  }
+}
diff --git a/backend/src/routes/dossiers/dossiers.module.ts b/backend/src/routes/dossiers/dossiers.module.ts
index 66026d2..e6ba196 100644
--- a/backend/src/routes/dossiers/dossiers.module.ts
+++ b/backend/src/routes/dossiers/dossiers.module.ts
@@ -1,4 +1,28 @@
 import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { JwtModule } from '@nestjs/jwt';
+import { Parents } from 'src/entities/parents.entity';
+import { AssistanteMaternelle } from 'src/entities/assistantes_maternelles.entity';
+import { ParentsModule } from '../parents/parents.module';
+import { DossiersController } from './dossiers.controller';
+import { DossiersService } from './dossiers.service';
 
-@Module({})
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([Parents, AssistanteMaternelle]),
+    ParentsModule,
+    JwtModule.registerAsync({
+      imports: [ConfigModule],
+      useFactory: (config: ConfigService) => ({
+        secret: config.get('jwt.accessSecret'),
+        signOptions: { expiresIn: config.get('jwt.accessExpiresIn') },
+      }),
+      inject: [ConfigService],
+    }),
+  ],
+  controllers: [DossiersController],
+  providers: [DossiersService],
+  exports: [DossiersService],
+})
 export class DossiersModule {}
diff --git a/backend/src/routes/dossiers/dossiers.service.ts b/backend/src/routes/dossiers/dossiers.service.ts
new file mode 100644
index 0000000..59d9f47
--- /dev/null
+++ b/backend/src/routes/dossiers/dossiers.service.ts
@@ -0,0 +1,81 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { Parents } from 'src/entities/parents.entity';
+import { AssistanteMaternelle } from 'src/entities/assistantes_maternelles.entity';
+import { ParentsService } from '../parents/parents.service';
+import { DossierUnifieDto } from './dto/dossier-unifie.dto';
+import { DossierAmCompletDto, DossierAmUserDto } from './dto/dossier-am-complet.dto';
+
+/**
+ * Endpoint unifié GET /dossiers/:numeroDossier – AM ou famille. Ticket #119.
+ */
+@Injectable()
+export class DossiersService {
+  constructor(
+    @InjectRepository(Parents)
+    private readonly parentsRepository: Repository<Parents>,
+    @InjectRepository(AssistanteMaternelle)
+    private readonly amRepository: Repository<AssistanteMaternelle>,
+    private readonly parentsService: ParentsService,
+  ) {}
+
+  async getDossierByNumero(numeroDossier: string): Promise<DossierUnifieDto> {
+    const num = numeroDossier?.trim();
+    if (!num) {
+      throw new NotFoundException('Numéro de dossier requis.');
+    }
+
+    // 1) Famille : un parent a ce numéro ?
+    const parentWithNum = await this.parentsRepository.findOne({
+      where: { numero_dossier: num },
+      select: ['user_id'],
+    });
+    if (parentWithNum) {
+      const dossier = await this.parentsService.getDossierFamilleByNumero(num);
+      return { type: 'family', dossier };
+    }
+
+    // 2) AM : une assistante maternelle a ce numéro ?
+    const am = await this.amRepository.findOne({
+      where: { numero_dossier: num },
+      relations: ['user'],
+    });
+    if (am?.user) {
+      const dossier: DossierAmCompletDto = {
+        numero_dossier: num,
+        user: this.toDossierAmUserDto(am.user),
+        numero_agrement: am.approval_number,
+        nir: am.nir,
+        biographie: am.biography,
+        disponible: am.available,
+        ville_residence: am.residence_city,
+        date_agrement: am.agreement_date,
+        annees_experience: am.years_experience,
+        specialite: am.specialty,
+        nb_max_enfants: am.max_children,
+        place_disponible: am.places_available,
+      };
+      return { type: 'am', dossier };
+    }
+
+    throw new NotFoundException('Aucun dossier trouvé pour ce numéro.');
+  }
+
+  private toDossierAmUserDto(user: { id: string; email: string; prenom?: string; nom?: string; telephone?: string; adresse?: string; ville?: string; code_postal?: string; profession?: string; date_naissance?: Date; photo_url?: string; statut: any }): DossierAmUserDto {
+    return {
+      id: user.id,
+      email: user.email,
+      prenom: user.prenom,
+      nom: user.nom,
+      telephone: user.telephone,
+      adresse: user.adresse,
+      ville: user.ville,
+      code_postal: user.code_postal,
+      profession: user.profession,
+      date_naissance: user.date_naissance,
+      photo_url: user.photo_url,
+      statut: user.statut,
+    };
+  }
+}
diff --git a/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts b/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts
new file mode 100644
index 0000000..0ddc8a1
--- /dev/null
+++ b/backend/src/routes/dossiers/dto/dossier-am-complet.dto.ts
@@ -0,0 +1,58 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { StatutUtilisateurType } from 'src/entities/users.entity';
+
+/** Utilisateur AM sans données sensibles (pour dossier AM complet). Ticket #119 */
+export class DossierAmUserDto {
+  @ApiProperty()
+  id: string;
+  @ApiProperty()
+  email: string;
+  @ApiProperty({ required: false })
+  prenom?: string;
+  @ApiProperty({ required: false })
+  nom?: string;
+  @ApiProperty({ required: false })
+  telephone?: string;
+  @ApiProperty({ required: false })
+  adresse?: string;
+  @ApiProperty({ required: false })
+  ville?: string;
+  @ApiProperty({ required: false })
+  code_postal?: string;
+  @ApiProperty({ required: false })
+  profession?: string;
+  @ApiProperty({ required: false })
+  date_naissance?: Date;
+  @ApiProperty({ required: false })
+  photo_url?: string;
+  @ApiProperty({ enum: StatutUtilisateurType })
+  statut: StatutUtilisateurType;
+}
+
+/** Dossier AM complet (fiche AM sans secrets). Ticket #119 */
+export class DossierAmCompletDto {
+  @ApiProperty({ example: '2026-000003', description: 'Numéro de dossier AM' })
+  numero_dossier: string;
+  @ApiProperty({ type: DossierAmUserDto, description: 'Utilisateur (sans mot de passe ni tokens)' })
+  user: DossierAmUserDto;
+  @ApiProperty({ required: false })
+  numero_agrement?: string;
+  @ApiProperty({ required: false })
+  nir?: string;
+  @ApiProperty({ required: false })
+  biographie?: string;
+  @ApiProperty({ required: false })
+  disponible?: boolean;
+  @ApiProperty({ required: false })
+  ville_residence?: string;
+  @ApiProperty({ required: false })
+  date_agrement?: Date;
+  @ApiProperty({ required: false })
+  annees_experience?: number;
+  @ApiProperty({ required: false })
+  specialite?: string;
+  @ApiProperty({ required: false })
+  nb_max_enfants?: number;
+  @ApiProperty({ required: false })
+  place_disponible?: number;
+}
diff --git a/backend/src/routes/dossiers/dto/dossier-unifie.dto.ts b/backend/src/routes/dossiers/dto/dossier-unifie.dto.ts
new file mode 100644
index 0000000..a51ae1b
--- /dev/null
+++ b/backend/src/routes/dossiers/dto/dossier-unifie.dto.ts
@@ -0,0 +1,14 @@
+import { ApiProperty } from '@nestjs/swagger';
+import { DossierFamilleCompletDto } from '../../parents/dto/dossier-famille-complet.dto';
+import { DossierAmCompletDto } from './dossier-am-complet.dto';
+
+/** Réponse unifiée GET /dossiers/:numeroDossier – AM ou famille. Ticket #119 */
+export class DossierUnifieDto {
+  @ApiProperty({ enum: ['family', 'am'], description: 'Type de dossier' })
+  type: 'family' | 'am';
+
+  @ApiProperty({
+    description: 'Dossier famille (si type=family) ou dossier AM (si type=am)',
+  })
+  dossier: DossierFamilleCompletDto | DossierAmCompletDto;
+}