diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java
index c681aaf51cb9..70f04f0baf72 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractKotlinCodegen.java
@@ -17,6 +17,7 @@
 
 package org.openapitools.codegen.languages;
 
+import com.fasterxml.jackson.databind.node.ArrayNode;
 import io.swagger.v3.oas.models.media.ArraySchema;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.media.StringSchema;
@@ -924,6 +925,24 @@ public String toDefaultValue(Schema schema) {
             if (p.getDefault() != null) {
                 return "URI.create('" + p.getDefault() + "')";
             }
+        } else if (ModelUtils.isArraySchema(p)) {
+            if (p.getDefault() != null) {
+                String arrInstantiationType = ModelUtils.isSet(p) ? "set" : "arrayList";
+
+                ArrayNode _default = (ArrayNode) p.getDefault();
+                if (_default.isEmpty()) {
+                    return arrInstantiationType + "Of()";
+                }
+
+                StringBuilder defaultContent = new StringBuilder();
+                Schema<?> itemsSchema = getSchemaItems((ArraySchema) schema);
+                _default.elements().forEachRemaining((element) -> {
+                    itemsSchema.setDefault(element.asText());
+                    defaultContent.append(toDefaultValue(itemsSchema)).append(",");
+                });
+                defaultContent.deleteCharAt(defaultContent.length()-1); // remove trailing comma
+                return arrInstantiationType + "Of(" + defaultContent + ")";
+            }
         } else if (ModelUtils.isStringSchema(p)) {
             if (p.getDefault() != null) {
                 String _default = (String) p.getDefault();
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassOptVar.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassOptVar.mustache
index 0fca42a0ad8c..81badfd31326 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassOptVar.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassOptVar.mustache
@@ -1,4 +1,4 @@
 {{#useBeanValidation}}{{>beanValidation}}{{>beanValidationModel}}{{/useBeanValidation}}{{#swaggerAnnotations}}
     @ApiModelProperty({{#example}}example = "{{{example}}}", {{/example}}{{#isReadOnly}}readOnly = {{{isReadOnly}}}, {{/isReadOnly}}value = "{{{description}}}"){{/swaggerAnnotations}}{{#deprecated}}
     @Deprecated(message = ""){{/deprecated}}
-    @field:JsonProperty("{{{baseName}}}"){{#isInherited}} override{{/isInherited}} {{>modelMutable}} {{{name}}}: {{#isEnum}}{{#isArray}}{{baseType}}<{{/isArray}}{{classname}}.{{nameInCamelCase}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}? = {{#defaultValue}}{{defaultValue}}{{/defaultValue}}{{^defaultValue}}null{{/defaultValue}}
\ No newline at end of file
+    @field:JsonProperty("{{{baseName}}}"){{#isInherited}} override{{/isInherited}} {{>modelMutable}} {{{name}}}: {{#isEnum}}{{#isArray}}{{baseType}}<{{/isArray}}{{classname}}.{{nameInCamelCase}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}? = {{#defaultValue}}{{{defaultValue}}}{{/defaultValue}}{{^defaultValue}}null{{/defaultValue}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassReqVar.mustache b/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassReqVar.mustache
index 27e16f95fca0..9e2cddf2d254 100644
--- a/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassReqVar.mustache
+++ b/modules/openapi-generator/src/main/resources/kotlin-spring/dataClassReqVar.mustache
@@ -1,3 +1,3 @@
 {{#useBeanValidation}}{{>beanValidation}}{{>beanValidationModel}}{{/useBeanValidation}}{{#swaggerAnnotations}}
     @ApiModelProperty({{#example}}example = "{{{example}}}", {{/example}}required = true, {{#isReadOnly}}readOnly = {{{isReadOnly}}}, {{/isReadOnly}}value = "{{{description}}}"){{/swaggerAnnotations}}
-    @field:JsonProperty("{{{baseName}}}", required = true){{#isInherited}} override{{/isInherited}} {{>modelMutable}} {{{name}}}: {{#isEnum}}{{#isArray}}{{baseType}}<{{/isArray}}{{classname}}.{{nameInCamelCase}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isReadOnly}}?{{/isReadOnly}}{{#defaultValue}} = {{defaultValue}}{{/defaultValue}}{{#isReadOnly}}{{^defaultValue}} = null{{/defaultValue}}{{/isReadOnly}}
\ No newline at end of file
+    @field:JsonProperty("{{{baseName}}}", required = true){{#isInherited}} override{{/isInherited}} {{>modelMutable}} {{{name}}}: {{#isEnum}}{{#isArray}}{{baseType}}<{{/isArray}}{{classname}}.{{nameInCamelCase}}{{#isArray}}>{{/isArray}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isReadOnly}}?{{/isReadOnly}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{#isReadOnly}}{{^defaultValue}} = null{{/defaultValue}}{{/isReadOnly}}
\ No newline at end of file