diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
index 4392dcff5df3..dcdcdee2f631 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractGoCodegen.java
@@ -389,6 +389,11 @@ public Map<String, Object> postProcessOperationsWithModels(Map<String, Object> o
                     }
                 }
 
+                // import "reflect" package if the parameter is collectionFormat=multi
+                if (param.isCollectionFormatMulti) {
+                    imports.add(createMapping("import", "reflect"));
+                }
+
                 // import "optionals" package if the parameter is optional
                 if (!param.required) {
                     if (!addedOptionalImport) {
diff --git a/modules/openapi-generator/src/main/resources/go/api.mustache b/modules/openapi-generator/src/main/resources/go/api.mustache
index 2b04681ac91a..a581a3be3c6c 100644
--- a/modules/openapi-generator/src/main/resources/go/api.mustache
+++ b/modules/openapi-generator/src/main/resources/go/api.mustache
@@ -132,11 +132,37 @@ func (a *{{{classname}}}Service) {{{nickname}}}(ctx context.Context{{#hasParams}
 	{{#hasQueryParams}}
 	{{#queryParams}}
 	{{#required}}
+	{{#isCollectionFormatMulti}}
+	t:={{paramName}}
+	if reflect.TypeOf(t).Kind() == reflect.Slice {
+		s := reflect.ValueOf(t)
+		for i := 0; i < s.Len(); i++ {
+			localVarQueryParams.Add("{{baseName}}", parameterToString(s.Index(i), "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+		}
+	} else {
+		localVarQueryParams.Add("{{baseName}}", parameterToString(t, "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+	}
+	{{/isCollectionFormatMulti}}
+	{{^isCollectionFormatMulti}}
 	localVarQueryParams.Add("{{baseName}}", parameterToString({{paramName}}, "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+	{{/isCollectionFormatMulti}}
 	{{/required}}
 	{{^required}}
 	if localVarOptionals != nil && localVarOptionals.{{vendorExtensions.x-exportParamName}}.IsSet() {
+	{{#isCollectionFormatMulti}}
+		t:=localVarOptionals.{{vendorExtensions.x-exportParamName}}.Value()
+		if reflect.TypeOf(t).Kind() == reflect.Slice {
+			s := reflect.ValueOf(t)
+			for i := 0; i < s.Len(); i++ {
+				localVarQueryParams.Add("{{baseName}}", parameterToString(s.Index(i), "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+			}
+		} else {
+			localVarQueryParams.Add("{{baseName}}", parameterToString(t, "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+		}
+	{{/isCollectionFormatMulti}}
+	{{^isCollectionFormatMulti}}
 		localVarQueryParams.Add("{{baseName}}", parameterToString(localVarOptionals.{{vendorExtensions.x-exportParamName}}.Value(), "{{#collectionFormat}}{{collectionFormat}}{{/collectionFormat}}"))
+	{{/isCollectionFormatMulti}}
 	}
 	{{/required}}
 	{{/queryParams}}