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diff --git a/pkg/v1/index.go b/pkg/v1/index.go
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+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package v1
+
+import (
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// ImageIndex defines the interface for interacting with an OCI image index.
+type ImageIndex interface {
+	// MediaType of this image's manifest.
+	MediaType() (types.MediaType, error)
+
+	// Digest returns the sha256 of this index's manifest.
+	Digest() (Hash, error)
+
+	// Size returns the size of the manifest.
+	Size() (int64, error)
+
+	// IndexManifest returns this image index's manifest object.
+	IndexManifest() (*IndexManifest, error)
+
+	// RawManifest returns the serialized bytes of IndexManifest().
+	RawManifest() ([]byte, error)
+
+	// Image returns a v1.Image that this ImageIndex references.
+	Image(Hash) (Image, error)
+
+	// ImageIndex returns a v1.ImageIndex that this ImageIndex references.
+	ImageIndex(Hash) (ImageIndex, error)
+}