Krenitsyn, spelt Krenitzin in the United States, may refer to any of the following:
- Pyotr Krenitsyn, a Russian explorer and Captain/Lieutenant of the Imperial Russian Navy.
- The highest peak on Onekotan Island, located in the midst of the Tao-Rusyr Caldera.
- The Krenitzin Islands in Alaska.
- Cape Krenitzin at the SW end of the Alaska Peninsula.