diff --git a/src/NzbDrone.Api.Test/v3/Qualities/QualityDefinitionResourceValidatorTest.cs b/src/NzbDrone.Api.Test/v3/Qualities/QualityDefinitionResourceValidatorTest.cs
new file mode 100644
index 000000000..f01d7f512
--- /dev/null
+++ b/src/NzbDrone.Api.Test/v3/Qualities/QualityDefinitionResourceValidatorTest.cs
@@ -0,0 +1,99 @@
+using FluentValidation.TestHelper;
+using NUnit.Framework;
+using NzbDrone.Core.Qualities;
+using Sonarr.Api.V3.Qualities;
+
+namespace NzbDrone.Api.Test.v3.Qualities;
+
+[Parallelizable(ParallelScope.All)]
+public class QualityDefinitionResourceValidatorTests
+{
+    private readonly QualityDefinitionResourceValidator _validator;
+    private readonly QualityDefinitionLimits _limits;
+
+    public QualityDefinitionResourceValidatorTests()
+    {
+        _limits = new QualityDefinitionLimits();
+        _validator = new QualityDefinitionResourceValidator(_limits);
+    }
+
+    [Test]
+    public void Validate_fails_when_min_size_is_below_min_limit()
+    {
+        var resource = new QualityDefinitionResource { MinSize = _limits.MinLimit - 1 };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldHaveValidationErrorFor(r => r.MinSize)
+            .WithErrorCode("GreaterThanOrEqualTo");
+    }
+
+    [Test]
+    public void Validate_fails_when_min_size_is_above_preferred_size()
+    {
+        var resource = new QualityDefinitionResource
+        {
+            MinSize = 10,
+            PreferredSize = 5
+        };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldHaveValidationErrorFor(r => r.MinSize)
+            .WithErrorCode("LessThanOrEqualTo");
+    }
+
+    [Test]
+    public void Validate_passes_when_min_size_is_within_limits()
+    {
+        var resource = new QualityDefinitionResource
+        {
+            MinSize = _limits.MinLimit,
+            PreferredSize = _limits.MaxLimit
+        };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+
+    [Test]
+    public void Validate_fails_when_max_size_is_below_preferred_size()
+    {
+        var resource = new QualityDefinitionResource
+        {
+            MaxSize = 5,
+            PreferredSize = 10
+        };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldHaveValidationErrorFor(r => r.MaxSize)
+            .WithErrorCode("GreaterThanOrEqualTo");
+    }
+
+    [Test]
+    public void Validate_fails_when_max_size_exceeds_max_limit()
+    {
+        var resource = new QualityDefinitionResource { MaxSize = _limits.MaxLimit + 1 };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldHaveValidationErrorFor(r => r.MaxSize)
+            .WithErrorCode("LessThanOrEqualTo");
+    }
+
+    [Test]
+    public void Validate_passes_when_max_size_is_within_limits()
+    {
+        var resource = new QualityDefinitionResource
+        {
+            MaxSize = _limits.MaxLimit,
+            PreferredSize = _limits.MinLimit
+        };
+
+        var result = _validator.TestValidate(resource);
+
+        result.ShouldNotHaveAnyValidationErrors();
+    }
+}
diff --git a/src/Sonarr.Api.V3/Qualities/QualityDefinitionController.cs b/src/Sonarr.Api.V3/Qualities/QualityDefinitionController.cs
index 19aab3d68..03c9c31f4 100644
--- a/src/Sonarr.Api.V3/Qualities/QualityDefinitionController.cs
+++ b/src/Sonarr.Api.V3/Qualities/QualityDefinitionController.cs
@@ -20,6 +20,15 @@ public QualityDefinitionController(IQualityDefinitionService qualityDefinitionSe
             : base(signalRBroadcaster)
         {
             _qualityDefinitionService = qualityDefinitionService;
+
+            SetupValidation(qualityDefinitionService);
+        }
+
+        private void SetupValidation(IQualityDefinitionService qualityDefinitionService)
+        {
+            var limits = qualityDefinitionService.GetLimits();
+            SharedValidator.RuleFor(c => c)
+                .SetValidator(new QualityDefinitionResourceValidator(limits));
         }
 
         [RestPutById]
diff --git a/src/Sonarr.Api.V3/Qualities/QualityDefinitionResourceValidator.cs b/src/Sonarr.Api.V3/Qualities/QualityDefinitionResourceValidator.cs
new file mode 100644
index 000000000..8a178e6d2
--- /dev/null
+++ b/src/Sonarr.Api.V3/Qualities/QualityDefinitionResourceValidator.cs
@@ -0,0 +1,28 @@
+using FluentValidation;
+using NzbDrone.Core.Qualities;
+
+namespace Sonarr.Api.V3.Qualities;
+
+public class QualityDefinitionResourceValidator : AbstractValidator<QualityDefinitionResource>
+{
+    public QualityDefinitionResourceValidator(QualityDefinitionLimits limits)
+    {
+        When(c => c.MinSize is not null, () =>
+        {
+            RuleFor(c => c.MinSize)
+                .GreaterThanOrEqualTo(limits.MinLimit)
+                .WithErrorCode("GreaterThanOrEqualTo")
+                .LessThanOrEqualTo(c => c.PreferredSize ?? limits.MaxLimit)
+                .WithErrorCode("LessThanOrEqualTo");
+        });
+
+        When(c => c.MaxSize is not null, () =>
+        {
+            RuleFor(c => c.MaxSize)
+                .GreaterThanOrEqualTo(c => c.PreferredSize ?? limits.MinLimit)
+                .WithErrorCode("GreaterThanOrEqualTo")
+                .LessThanOrEqualTo(limits.MaxLimit)
+                .WithErrorCode("LessThanOrEqualTo");
+        });
+    }
+}