diff --git a/Directory.Build.props b/Directory.Build.props
index 88b63d156c..71650fc16c 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -8,6 +8,11 @@
     <RootNamespace>Bit.$(MSBuildProjectName)</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
+    <!-- Treat it as a test project if the project hasn't set their own value and it follows our test project conventions -->
+    <IsTestProject Condition="'$(IsTestProject)' == '' and ($(MSBuildProjectName.EndsWith('.Test')) or $(MSBuildProjectName.EndsWith('.IntegrationTest')))">true</IsTestProject>
+    <Nullable Condition="'$(Nullable)' == '' and '$(IsTestProject)' == 'true'">annotations</Nullable>
+    <!-- Uncomment the below line when we are ready to enable nullable repo wide -->
+    <!-- <Nullable Condition="'$(Nullable)' == '' and '$(IsTestProject)' != 'true'">enable</Nullable> -->
   </PropertyGroup>
 
   <!--
diff --git a/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/GroupsControllerTests.cs b/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/GroupsControllerTests.cs
index 6742c6e0ad..f8150fc1c5 100644
--- a/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/GroupsControllerTests.cs
+++ b/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/GroupsControllerTests.cs
@@ -248,7 +248,7 @@ public class GroupsControllerTests : IClassFixture<ScimApplicationFactory>, IAsy
     [InlineData(null)]
     [InlineData("")]
     [InlineData(" ")]
-    public async Task Post_InvalidDisplayName_BadRequest(string displayName)
+    public async Task Post_InvalidDisplayName_BadRequest(string? displayName)
     {
         var organizationId = ScimApplicationFactory.TestOrganizationId1;
         var model = new ScimGroupRequestModel
diff --git a/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/UsersControllerTests.cs b/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/UsersControllerTests.cs
index 1c9b0c1127..4c4fda952a 100644
--- a/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/UsersControllerTests.cs
+++ b/bitwarden_license/test/Scim.IntegrationTest/Controllers/v2/UsersControllerTests.cs
@@ -324,7 +324,7 @@ public class UsersControllerTests : IClassFixture<ScimApplicationFactory>, IAsyn
     [InlineData(null)]
     [InlineData("")]
     [InlineData(" ")]
-    public async Task Post_InvalidEmail_BadRequest(string email)
+    public async Task Post_InvalidEmail_BadRequest(string? email)
     {
         var displayName = "Test User 5";
         var externalId = "UE";
diff --git a/test/Api.IntegrationTest/Api.IntegrationTest.csproj b/test/Api.IntegrationTest/Api.IntegrationTest.csproj
index 3e300df9ca..8fa74f98d4 100644
--- a/test/Api.IntegrationTest/Api.IntegrationTest.csproj
+++ b/test/Api.IntegrationTest/Api.IntegrationTest.csproj
@@ -1,6 +1,5 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
-    <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
   </PropertyGroup>
 
diff --git a/test/Core.Test/AdminConsole/Services/OrganizationServiceTests.cs b/test/Core.Test/AdminConsole/Services/OrganizationServiceTests.cs
index f4440a65a3..52dd39e182 100644
--- a/test/Core.Test/AdminConsole/Services/OrganizationServiceTests.cs
+++ b/test/Core.Test/AdminConsole/Services/OrganizationServiceTests.cs
@@ -41,8 +41,6 @@ using Xunit;
 using Organization = Bit.Core.AdminConsole.Entities.Organization;
 using OrganizationUser = Bit.Core.Entities.OrganizationUser;
 
-#nullable enable
-
 namespace Bit.Core.Test.Services;
 
 [SutProviderCustomize]
diff --git a/test/Core.Test/Auth/Models/Business/Tokenables/OrgUserInviteTokenableTests.cs b/test/Core.Test/Auth/Models/Business/Tokenables/OrgUserInviteTokenableTests.cs
index aeeda206fa..866cdbfe29 100644
--- a/test/Core.Test/Auth/Models/Business/Tokenables/OrgUserInviteTokenableTests.cs
+++ b/test/Core.Test/Auth/Models/Business/Tokenables/OrgUserInviteTokenableTests.cs
@@ -109,7 +109,7 @@ public class OrgUserInviteTokenableTests
     [Theory]
     [InlineData(null)]
     [InlineData("")]
-    public void Valid_NullOrEmptyOrgUserEmail_ReturnsFalse(string email)
+    public void Valid_NullOrEmptyOrgUserEmail_ReturnsFalse(string? email)
     {
         var token = new OrgUserInviteTokenable
         {
diff --git a/test/Core.Test/Utilities/CoreHelpersTests.cs b/test/Core.Test/Utilities/CoreHelpersTests.cs
index 2cce276fcb..264a55b6ee 100644
--- a/test/Core.Test/Utilities/CoreHelpersTests.cs
+++ b/test/Core.Test/Utilities/CoreHelpersTests.cs
@@ -271,7 +271,7 @@ public class CoreHelpersTests
     [InlineData("ascii.com", "ascii.com")]
     [InlineData("", "")]
     [InlineData(null, null)]
-    public void PunyEncode_Success(string text, string expected)
+    public void PunyEncode_Success(string? text, string? expected)
     {
         var actual = CoreHelpers.PunyEncode(text);
         Assert.Equal(expected, actual);
@@ -435,7 +435,7 @@ public class CoreHelpersTests
     [InlineData("name@", "name@")] // @ symbol but no domain
     [InlineData("", "")] // Empty string
     [InlineData(null, null)] // null
-    public void ObfuscateEmail_Success(string input, string expected)
+    public void ObfuscateEmail_Success(string? input, string? expected)
     {
         Assert.Equal(expected, CoreHelpers.ObfuscateEmail(input));
     }
@@ -456,7 +456,7 @@ public class CoreHelpersTests
     [InlineData("user@")]
     [InlineData("@example.com")]
     [InlineData("user@ex@ample.com")]
-    public void GetEmailDomain_ReturnsNull(string wrongEmail)
+    public void GetEmailDomain_ReturnsNull(string? wrongEmail)
     {
         Assert.Null(CoreHelpers.GetEmailDomain(wrongEmail));
     }
diff --git a/test/Core.Test/Utilities/EncryptedStringAttributeTests.cs b/test/Core.Test/Utilities/EncryptedStringAttributeTests.cs
index 859d7cd6f2..b5989987fb 100644
--- a/test/Core.Test/Utilities/EncryptedStringAttributeTests.cs
+++ b/test/Core.Test/Utilities/EncryptedStringAttributeTests.cs
@@ -25,7 +25,7 @@ public class EncryptedStringAttributeTests
     [InlineData("Rsa2048_OaepSha256_HmacSha256_B64.QmFzZTY0UGFydA==|QmFzZTY0UGFydA==")] // Valid Rsa2048_OaepSha256_HmacSha256_B64 as a string
     [InlineData("6.QmFzZTY0UGFydA==|QmFzZTY0UGFydA==")] // Valid Rsa2048_OaepSha1_HmacSha256_B64 as a number
     [InlineData("Rsa2048_OaepSha1_HmacSha256_B64.QmFzZTY0UGFydA==|QmFzZTY0UGFydA==")]
-    public void IsValid_ReturnsTrue_WhenValid(string input)
+    public void IsValid_ReturnsTrue_WhenValid(string? input)
     {
         var sut = new EncryptedStringAttribute();
 
diff --git a/test/Core.Test/Utilities/StrictEmailAddressAttributeTests.cs b/test/Core.Test/Utilities/StrictEmailAddressAttributeTests.cs
index bcd3efcc13..3e375a1d9f 100644
--- a/test/Core.Test/Utilities/StrictEmailAddressAttributeTests.cs
+++ b/test/Core.Test/Utilities/StrictEmailAddressAttributeTests.cs
@@ -47,7 +47,7 @@ public class StrictEmailAttributeTests
     [InlineData("hellothere@world.com-")]               // domain ending in hyphen
     [InlineData("hellö@world.com")]                     // unicode at end of local-part
     [InlineData("héllo@world.com")]                     // unicode in middle of local-part
-    public void IsValid_ReturnsFalseWhenInvalid(string email)
+    public void IsValid_ReturnsFalseWhenInvalid(string? email)
     {
         var sut = new StrictEmailAddressAttribute();
 
diff --git a/test/Core.Test/Utilities/StrictEmailAddressListAttributeTests.cs b/test/Core.Test/Utilities/StrictEmailAddressListAttributeTests.cs
index 2ec5a45689..745b5851e1 100644
--- a/test/Core.Test/Utilities/StrictEmailAddressListAttributeTests.cs
+++ b/test/Core.Test/Utilities/StrictEmailAddressListAttributeTests.cs
@@ -42,7 +42,7 @@ public class StrictEmailAddressListAttributeTests
     [Theory]
     [InlineData("single@email.com", false)]
     [InlineData(null, false)]
-    public void IsValid_ReturnsTrue_WhenValid(string email, bool valid)
+    public void IsValid_ReturnsTrue_WhenValid(string? email, bool valid)
     {
         var sut = new StrictEmailAddressListAttribute();
 
diff --git a/test/Events.IntegrationTest/Events.IntegrationTest.csproj b/test/Events.IntegrationTest/Events.IntegrationTest.csproj
index 0b51185298..dbfe147892 100644
--- a/test/Events.IntegrationTest/Events.IntegrationTest.csproj
+++ b/test/Events.IntegrationTest/Events.IntegrationTest.csproj
@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
@@ -21,9 +20,9 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\..\src\Events\Events.csproj" />
-    <ProjectReference Include="..\IntegrationTestCommon\IntegrationTestCommon.csproj" />
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Events\Events.csproj" />
+    <ProjectReference Include="..\IntegrationTestCommon\IntegrationTestCommon.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/test/Icons.Test/Models/IconLinkTests.cs b/test/Icons.Test/Models/IconLinkTests.cs
index 3801558d8d..a4087f2b74 100644
--- a/test/Icons.Test/Models/IconLinkTests.cs
+++ b/test/Icons.Test/Models/IconLinkTests.cs
@@ -45,7 +45,7 @@ public class IconLinkTests
     [InlineData(" ", false)]
     [InlineData("unusable", false)]
     [InlineData("ico", true)]
-    public void WithNoRel_IsUsable(string extension, bool expectedResult)
+    public void WithNoRel_IsUsable(string? extension, bool expectedResult)
     {
         SetAttributeValue("href", $"/favicon.{extension}");
 
diff --git a/test/Identity.Test/Identity.Test.csproj b/test/Identity.Test/Identity.Test.csproj
index f18ecee6e8..fc0cf07b63 100644
--- a/test/Identity.Test/Identity.Test.csproj
+++ b/test/Identity.Test/Identity.Test.csproj
@@ -1,8 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-      <Nullable>enable</Nullable>
-      <IsPackable>false</IsPackable>
+    <IsPackable>false</IsPackable>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/test/Infrastructure.Dapper.Test/Infrastructure.Dapper.Test.csproj b/test/Infrastructure.Dapper.Test/Infrastructure.Dapper.Test.csproj
index 1ba67ba61e..fdef3c6cac 100644
--- a/test/Infrastructure.Dapper.Test/Infrastructure.Dapper.Test.csproj
+++ b/test/Infrastructure.Dapper.Test/Infrastructure.Dapper.Test.csproj
@@ -3,8 +3,6 @@
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-
     <IsPackable>false</IsPackable>
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
@@ -22,8 +20,8 @@
     </PackageReference>
   </ItemGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\..\src\Infrastructure.Dapper\Infrastructure.Dapper.csproj" />
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Infrastructure.Dapper\Infrastructure.Dapper.csproj" />
   </ItemGroup>
 
 </Project>
diff --git a/test/Infrastructure.IntegrationTest/Infrastructure.IntegrationTest.csproj b/test/Infrastructure.IntegrationTest/Infrastructure.IntegrationTest.csproj
index 159572f387..6d9e0d6667 100644
--- a/test/Infrastructure.IntegrationTest/Infrastructure.IntegrationTest.csproj
+++ b/test/Infrastructure.IntegrationTest/Infrastructure.IntegrationTest.csproj
@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <Nullable>enable</Nullable>
     <IsPackable>false</IsPackable>
     <UserSecretsId>6570f288-5c2c-47ad-8978-f3da255079c2</UserSecretsId>
   </PropertyGroup>