diff --git a/modules/openapi-generator/src/main/resources/aspnetcore/3.0/Project.csproj.mustache b/modules/openapi-generator/src/main/resources/aspnetcore/3.0/Project.csproj.mustache
index 83036fc53a7e..957371b31143 100644
--- a/modules/openapi-generator/src/main/resources/aspnetcore/3.0/Project.csproj.mustache
+++ b/modules/openapi-generator/src/main/resources/aspnetcore/3.0/Project.csproj.mustache
@@ -40,6 +40,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="{{newtonsoftVersion}}" />
 {{/useNewtonsoft}}
 {{/useSwashbuckle}}
+    <PackageReference Include="JsonSubTypes" Version="1.8.0" />
   </ItemGroup>
   <ItemGroup>
     <!--<DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Design" Version="{{aspnetCoreVersion}}.0" />-->
diff --git a/modules/openapi-generator/src/main/resources/aspnetcore/3.0/model.mustache b/modules/openapi-generator/src/main/resources/aspnetcore/3.0/model.mustache
index 491b39e54a14..5bd13ab9058a 100644
--- a/modules/openapi-generator/src/main/resources/aspnetcore/3.0/model.mustache
+++ b/modules/openapi-generator/src/main/resources/aspnetcore/3.0/model.mustache
@@ -7,6 +7,13 @@ using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Runtime.Serialization;
 using Newtonsoft.Json;
+{{#models}}
+{{#model}}
+{{#discriminator}}
+using JsonSubTypes;
+{{/discriminator}}
+{{/model}}
+{{/models}}
 using {{packageName}}.Converters;
 
 {{#models}}
@@ -17,6 +24,12 @@ namespace {{modelPackage}}
     /// {{description}}
     /// </summary>
     [DataContract]
+    {{#discriminator}}
+    [JsonConverter(typeof(JsonSubtypes), "{{{discriminatorName}}}")]
+    {{#mappedModels}}
+    [JsonSubtypes.KnownSubType(typeof({{{modelName}}}), "{{^vendorExtensions.x-discriminator-value}}{{{mappingName}}}{{/vendorExtensions.x-discriminator-value}}{{#vendorExtensions.x-discriminator-value}}{{{.}}}{{/vendorExtensions.x-discriminator-value}}")]
+    {{/mappedModels}}
+    {{/discriminator}}
     public {{#modelClassModifier}}{{modelClassModifier}} {{/modelClassModifier}}class {{classname}} : {{#parent}}{{{parent}}}, {{/parent}}IEquatable<{{classname}}>
     {
         {{#vars}}