diff --git a/docs/IMPLEMENTATION_PLAN.md b/docs/IMPLEMENTATION_PLAN.md
index cbdbe24..8040ac4 100644
--- a/docs/IMPLEMENTATION_PLAN.md
+++ b/docs/IMPLEMENTATION_PLAN.md
@@ -328,7 +328,7 @@ NavMenu.razor:
 | ✓ | A3 | Foundation | DTOs | 5 DTO-Dateien |
 | ✓ | A4 | Foundation | Service Interfaces | 5 Service-Interface-Dateien |
 | ✓ | A5 | Foundation | Service Implementations | 5 Service-Dateien |
-| ☐ | A6 | Foundation | AutoMapper Profiles | 5 Mapping-Dateien |
+| ✓ | A6 | Foundation | AutoMapper Profiles | 5 Mapping-Dateien |
 | ☐ | A7 | Foundation | DI Registration | 2 DI-Dateien ändern |
 | ☐ | **B1** | **Clubs** | **ClubState Fluxor** | **4 State-Dateien** |
 | ☐ | **B2** | **Clubs** | **Club Pages - ERSTES TESTBARES MVP** | **1 Razor** |
@@ -417,7 +417,7 @@ NavMenu.razor:
 5. `src/Koogle.Application/Services/PersonExpenseService.cs`
 
 **Dependencies:** Repository, ICurrentClubContext, ICurrentUserService, IMapper
-**Business Logic:** ClubId-Injection, Audit-Felder, Validierung
+**Business Logic:** ClubId-Injection, Audit-Felder, Validierung (mittels FluentValidation)
 
 ---
 
diff --git a/src/Koogle.Application/Koogle.Application.csproj b/src/Koogle.Application/Koogle.Application.csproj
index 1ca911e..6dbec0b 100644
--- a/src/Koogle.Application/Koogle.Application.csproj
+++ b/src/Koogle.Application/Koogle.Application.csproj
@@ -6,8 +6,15 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <Compile Remove="NewFolder\**" />
+    <EmbeddedResource Remove="NewFolder\**" />
+    <None Remove="NewFolder\**" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="AutoMapper" Version="15.1.0" />
+    <PackageReference Include="FluentValidation" Version="12.1.1" />
   </ItemGroup>
 
   <ItemGroup>
@@ -15,4 +22,8 @@
     <ProjectReference Include="..\Koogle.Infrastructure\Koogle.Infrastructure.csproj" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Folder Include="Validators\" />
+  </ItemGroup>
+
 </Project>
diff --git a/src/Koogle.Application/Mapping/ClubMappingProfile.cs b/src/Koogle.Application/Mapping/ClubMappingProfile.cs
new file mode 100644
index 0000000..4188c16
--- /dev/null
+++ b/src/Koogle.Application/Mapping/ClubMappingProfile.cs
@@ -0,0 +1,37 @@
+using AutoMapper;
+using Koogle.Application.DTOs;
+using Koogle.Domain.Entities;
+
+namespace Koogle.Application.Mapping;
+
+/// <summary>
+/// AutoMapper profile for Club entity mappings.
+/// </summary>
+public class ClubMappingProfile : Profile
+{
+    /// <summary>
+    /// Initializes Club entity to DTO mappings.
+    /// </summary>
+    public ClubMappingProfile()
+    {
+        // Club -> ClubDto
+        CreateMap<Club, ClubDto>();
+
+        // CreateClubDto -> Club (for creation)
+        CreateMap<CreateClubDto, Club>()
+            .ForMember(d => d.Id, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+
+        // UpdateClubDto -> Club (for updates)
+        CreateMap<UpdateClubDto, Club>()
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+    }
+}
diff --git a/src/Koogle.Application/Mapping/DayMappingProfile.cs b/src/Koogle.Application/Mapping/DayMappingProfile.cs
new file mode 100644
index 0000000..acdce31
--- /dev/null
+++ b/src/Koogle.Application/Mapping/DayMappingProfile.cs
@@ -0,0 +1,56 @@
+using AutoMapper;
+using Koogle.Application.DTOs;
+using Koogle.Domain.Entities;
+
+namespace Koogle.Application.Mapping;
+
+/// <summary>
+/// AutoMapper profile for Day entity mappings.
+/// </summary>
+public class DayMappingProfile : Profile
+{
+    /// <summary>
+    /// Initializes Day entity to DTO mappings.
+    /// </summary>
+    public DayMappingProfile()
+    {
+        // Day -> DayDto
+        CreateMap<Day, DayDto>()
+            .ForMember(d => d.ClubName, o => o.MapFrom(s => s.Club != null ? s.Club.Name : null))
+            .ForMember(d => d.ParticipantCount, o => o.MapFrom(s => s.DayPersons.Count))
+            .ForMember(d => d.Participants, o => o.MapFrom(s => s.DayPersons));
+
+        // Day -> DaySummaryDto
+        CreateMap<Day, DaySummaryDto>()
+            .ForMember(d => d.ParticipantCount, o => o.MapFrom(s => s.DayPersons.Count));
+
+        // DayPerson -> DayParticipantDto
+        CreateMap<DayPerson, DayParticipantDto>()
+            .ForMember(d => d.PersonName, o => o.MapFrom(s => s.Person != null ? s.Person.Name : string.Empty))
+            .ForMember(d => d.PersonStatus, o => o.MapFrom(s => s.Person != null ? s.Person.PersonStatus : default));
+
+        // CreateDayDto -> Day (for creation)
+        CreateMap<CreateDayDto, Day>()
+            .ForMember(d => d.Id, o => o.Ignore())
+            .ForMember(d => d.Status, o => o.Ignore())
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.DayPersons, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+
+        // UpdateDayDto -> Day (for updates)
+        CreateMap<UpdateDayDto, Day>()
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.DayPersons, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+    }
+}
diff --git a/src/Koogle.Application/Mapping/ExpenseMappingProfile.cs b/src/Koogle.Application/Mapping/ExpenseMappingProfile.cs
new file mode 100644
index 0000000..7bb3229
--- /dev/null
+++ b/src/Koogle.Application/Mapping/ExpenseMappingProfile.cs
@@ -0,0 +1,44 @@
+using AutoMapper;
+using Koogle.Application.DTOs;
+using Koogle.Domain.Entities;
+
+namespace Koogle.Application.Mapping;
+
+/// <summary>
+/// AutoMapper profile for Expense entity mappings.
+/// </summary>
+public class ExpenseMappingProfile : Profile
+{
+    /// <summary>
+    /// Initializes Expense entity to DTO mappings.
+    /// </summary>
+    public ExpenseMappingProfile()
+    {
+        // Expense -> ExpenseDto
+        CreateMap<Expense, ExpenseDto>();
+
+        // Expense -> ExpenseSummaryDto
+        CreateMap<Expense, ExpenseSummaryDto>();
+
+        // CreateExpenseDto -> Expense (for creation)
+        CreateMap<CreateExpenseDto, Expense>()
+            .ForMember(d => d.Id, o => o.Ignore())
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+
+        // UpdateExpenseDto -> Expense (for updates)
+        CreateMap<UpdateExpenseDto, Expense>()
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+    }
+}
diff --git a/src/Koogle.Application/Mapping/PersonExpenseMappingProfile.cs b/src/Koogle.Application/Mapping/PersonExpenseMappingProfile.cs
new file mode 100644
index 0000000..d3c40c2
--- /dev/null
+++ b/src/Koogle.Application/Mapping/PersonExpenseMappingProfile.cs
@@ -0,0 +1,41 @@
+using AutoMapper;
+using Koogle.Application.DTOs;
+using Koogle.Domain.Entities;
+
+namespace Koogle.Application.Mapping;
+
+/// <summary>
+/// AutoMapper profile for PersonExpense entity mappings.
+/// </summary>
+public class PersonExpenseMappingProfile : Profile
+{
+    /// <summary>
+    /// Initializes PersonExpense entity to DTO mappings.
+    /// </summary>
+    public PersonExpenseMappingProfile()
+    {
+        // PersonExpense -> PersonExpenseDto
+        CreateMap<PersonExpense, PersonExpenseDto>()
+            .ForMember(d => d.PersonName, o => o.MapFrom(s => s.Person != null ? s.Person.Name : string.Empty))
+            .ForMember(d => d.DayPostDate, o => o.MapFrom(s => s.Day != null ? s.Day.PostDate : default));
+
+        // CreatePersonExpenseDto -> PersonExpense (for creation)
+        CreateMap<CreatePersonExpenseDto, PersonExpense>()
+            .ForMember(d => d.Id, o => o.Ignore())
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Name, o => o.Ignore())
+            .ForMember(d => d.ExpenseType, o => o.Ignore())
+            .ForMember(d => d.PersonExpenseStatus, o => o.Ignore())
+            .ForMember(d => d.AssignedById, o => o.Ignore())
+            .ForMember(d => d.Person, o => o.Ignore())
+            .ForMember(d => d.Day, o => o.Ignore())
+            .ForMember(d => d.Expense, o => o.Ignore())
+            .ForMember(d => d.Game, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+    }
+}
diff --git a/src/Koogle.Application/Mapping/PersonMappingProfile.cs b/src/Koogle.Application/Mapping/PersonMappingProfile.cs
new file mode 100644
index 0000000..66ea9d9
--- /dev/null
+++ b/src/Koogle.Application/Mapping/PersonMappingProfile.cs
@@ -0,0 +1,49 @@
+using AutoMapper;
+using Koogle.Application.DTOs;
+using Koogle.Domain.Entities;
+
+namespace Koogle.Application.Mapping;
+
+/// <summary>
+/// AutoMapper profile for Person entity mappings.
+/// </summary>
+public class PersonMappingProfile : Profile
+{
+    /// <summary>
+    /// Initializes Person entity to DTO mappings.
+    /// </summary>
+    public PersonMappingProfile()
+    {
+        // Person -> PersonDto
+        CreateMap<Person, PersonDto>()
+            .ForMember(d => d.ClubName, o => o.MapFrom(s => s.Club != null ? s.Club.Name : null));
+
+        // Person -> PersonSummaryDto
+        CreateMap<Person, PersonSummaryDto>();
+
+        // CreatePersonDto -> Person (for creation)
+        CreateMap<CreatePersonDto, Person>()
+            .ForMember(d => d.Id, o => o.Ignore())
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.Expenses, o => o.Ignore())
+            .ForMember(d => d.DayPersons, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+
+        // UpdatePersonDto -> Person (for updates)
+        CreateMap<UpdatePersonDto, Person>()
+            .ForMember(d => d.ClubId, o => o.Ignore())
+            .ForMember(d => d.Club, o => o.Ignore())
+            .ForMember(d => d.Expenses, o => o.Ignore())
+            .ForMember(d => d.DayPersons, o => o.Ignore())
+            .ForMember(d => d.CreatedAt, o => o.Ignore())
+            .ForMember(d => d.CreatedById, o => o.Ignore())
+            .ForMember(d => d.ModifiedAt, o => o.Ignore())
+            .ForMember(d => d.ModifiedById, o => o.Ignore())
+            .ForMember(d => d.IsDeleted, o => o.Ignore());
+    }
+}