diff --git a/src/modules/projects/dto/create-timesheet.dto.ts b/src/modules/projects/dto/create-timesheet.dto.ts
new file mode 100644
index 0000000..b7c92a3
--- /dev/null
+++ b/src/modules/projects/dto/create-timesheet.dto.ts
@@ -0,0 +1,83 @@
+// Note: Basic CreateTimesheetDto, UpdateTimesheetDto, TimesheetFilters are defined in timesheets.service.ts
+// This file contains extended DTOs for additional functionality
+
+/**
+ * Respuesta de timesheet con datos relacionados
+ */
+export interface TimesheetResponse {
+  id: string;
+  tenant_id: string;
+  company_id: string;
+  project_id: string;
+  project_name?: string;
+  task_id: string | null;
+  task_name?: string;
+  user_id: string;
+  user_name?: string;
+  date: Date;
+  hours: number;
+  description: string | null;
+  billable: boolean;
+  invoiced: boolean;
+  invoice_id: string | null;
+  status: 'draft' | 'submitted' | 'approved' | 'rejected';
+  approved_by: string | null;
+  approved_at: Date | null;
+  created_at: Date;
+  created_by: string | null;
+  updated_at: Date | null;
+}
+
+/**
+ * Resumen de horas por proyecto
+ */
+export interface TimesheetSummaryByProject {
+  project_id: string;
+  project_name: string;
+  total_hours: number;
+  billable_hours: number;
+  non_billable_hours: number;
+  invoiced_hours: number;
+  pending_hours: number;
+}
+
+/**
+ * Resumen de horas por usuario
+ */
+export interface TimesheetSummaryByUser {
+  user_id: string;
+  user_name: string;
+  total_hours: number;
+  billable_hours: number;
+  approved_hours: number;
+  pending_approval: number;
+}
+
+/**
+ * Resumen de horas por tarea
+ */
+export interface TimesheetSummaryByTask {
+  task_id: string;
+  task_name: string;
+  project_id: string;
+  project_name: string;
+  estimated_hours: number;
+  spent_hours: number;
+  remaining_hours: number;
+  progress_percentage: number;
+}
+
+/**
+ * Resumen general de timesheets
+ */
+export interface TimesheetSummary {
+  total_hours: number;
+  billable_hours: number;
+  non_billable_hours: number;
+  invoiced_hours: number;
+  approved_hours: number;
+  pending_approval_hours: number;
+  by_project?: TimesheetSummaryByProject[];
+  by_user?: TimesheetSummaryByUser[];
+  by_task?: TimesheetSummaryByTask[];
+}
diff --git a/src/modules/projects/dto/index.ts b/src/modules/projects/dto/index.ts
new file mode 100644
index 0000000..706e496
--- /dev/null
+++ b/src/modules/projects/dto/index.ts
@@ -0,0 +1,2 @@
+export * from './create-timesheet.dto.js';
+export * from './update-timesheet.dto.js';
diff --git a/src/modules/projects/dto/update-timesheet.dto.ts b/src/modules/projects/dto/update-timesheet.dto.ts
new file mode 100644
index 0000000..3e8d372
--- /dev/null
+++ b/src/modules/projects/dto/update-timesheet.dto.ts
@@ -0,0 +1,42 @@
+// Note: Basic UpdateTimesheetDto is defined in timesheets.service.ts
+// This file contains extended DTOs for additional functionality
+
+/**
+ * DTO para enviar un timesheet a aprobacion
+ */
+export interface SubmitTimesheetDto {
+  /** IDs de los timesheets a enviar */
+  timesheet_ids: string[];
+}
+
+/**
+ * DTO para aprobar/rechazar timesheets
+ */
+export interface ApproveTimesheetDto {
+  /** IDs de los timesheets a aprobar/rechazar */
+  timesheet_ids: string[];
+  /** Comentario opcional del aprobador */
+  comment?: string;
+}
+
+/**
+ * DTO para marcar timesheets como facturados
+ */
+export interface MarkInvoicedDto {
+  /** IDs de los timesheets a marcar */
+  timesheet_ids: string[];
+  /** ID de la factura */
+  invoice_id: string;
+}
+
+/**
+ * DTO para accion masiva sobre timesheets
+ */
+export interface BulkTimesheetActionDto {
+  /** IDs de los timesheets */
+  timesheet_ids: string[];
+  /** Accion a realizar */
+  action: 'submit' | 'approve' | 'reject' | 'delete';
+  /** Comentario opcional */
+  comment?: string;
+}
diff --git a/src/modules/projects/entities/index.ts b/src/modules/projects/entities/index.ts
new file mode 100644
index 0000000..94033da
--- /dev/null
+++ b/src/modules/projects/entities/index.ts
@@ -0,0 +1 @@
+export * from './timesheet.entity.js';
diff --git a/src/modules/projects/entities/timesheet.entity.ts b/src/modules/projects/entities/timesheet.entity.ts
new file mode 100644
index 0000000..3304761
--- /dev/null
+++ b/src/modules/projects/entities/timesheet.entity.ts
@@ -0,0 +1,95 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  UpdateDateColumn,
+  Index,
+  ManyToOne,
+  JoinColumn,
+} from 'typeorm';
+
+export enum TimesheetStatus {
+  DRAFT = 'draft',
+  SUBMITTED = 'submitted',
+  APPROVED = 'approved',
+  REJECTED = 'rejected',
+}
+
+@Entity({ schema: 'projects', name: 'timesheets' })
+@Index('idx_timesheets_tenant', ['tenantId'])
+@Index('idx_timesheets_company', ['companyId'])
+@Index('idx_timesheets_project', ['projectId'])
+@Index('idx_timesheets_task', ['taskId'])
+@Index('idx_timesheets_user', ['userId'])
+@Index('idx_timesheets_user_date', ['userId', 'date'])
+@Index('idx_timesheets_date', ['date'])
+@Index('idx_timesheets_status', ['status'])
+export class TimesheetEntity {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column({ type: 'uuid', nullable: false, name: 'tenant_id' })
+  tenantId: string;
+
+  @Column({ type: 'uuid', nullable: false, name: 'company_id' })
+  companyId: string;
+
+  @Column({ type: 'uuid', nullable: false, name: 'project_id' })
+  projectId: string;
+
+  @Column({ type: 'uuid', nullable: true, name: 'task_id' })
+  taskId: string | null;
+
+  @Column({ type: 'uuid', nullable: false, name: 'user_id' })
+  userId: string;
+
+  @Column({ type: 'date', nullable: false })
+  date: Date;
+
+  @Column({ type: 'decimal', precision: 5, scale: 2, nullable: false })
+  hours: number;
+
+  @Column({ type: 'text', nullable: true })
+  description: string | null;
+
+  @Column({ type: 'boolean', default: true, nullable: false })
+  billable: boolean;
+
+  @Column({ type: 'boolean', default: false, nullable: false })
+  invoiced: boolean;
+
+  @Column({ type: 'uuid', nullable: true, name: 'invoice_id' })
+  invoiceId: string | null;
+
+  @Column({
+    type: 'enum',
+    enum: TimesheetStatus,
+    default: TimesheetStatus.DRAFT,
+    nullable: false,
+  })
+  status: TimesheetStatus;
+
+  @Column({ type: 'uuid', nullable: true, name: 'approved_by' })
+  approvedBy: string | null;
+
+  @Column({ type: 'timestamp', nullable: true, name: 'approved_at' })
+  approvedAt: Date | null;
+
+  // Audit fields
+  @CreateDateColumn({ name: 'created_at', type: 'timestamp' })
+  createdAt: Date;
+
+  @Column({ type: 'uuid', nullable: true, name: 'created_by' })
+  createdBy: string | null;
+
+  @UpdateDateColumn({
+    name: 'updated_at',
+    type: 'timestamp',
+    nullable: true,
+  })
+  updatedAt: Date | null;
+
+  @Column({ type: 'uuid', nullable: true, name: 'updated_by' })
+  updatedBy: string | null;
+}
diff --git a/src/modules/projects/index.ts b/src/modules/projects/index.ts
index 94e7545..c5a5215 100644
--- a/src/modules/projects/index.ts
+++ b/src/modules/projects/index.ts
@@ -5,3 +5,9 @@ export * from './billing.service.js';
 export * from './hr-integration.service.js';
 export * from './projects.controller.js';
 export { default as projectsRoutes } from './projects.routes.js';
+
+// Entities
+export * from './entities/index.js';
+
+// DTOs
+export * from './dto/index.js';