| Petrof Bay | |
| Location: | Alaska |
| Type: | Bay |
| Pushpin Map: | Alaska |
Petrof Bay is a small bay on the west side of Kuiu Island in the Alexander Archipelago in southeastern Alaska, United States. It is located at and opens into the Chatham Strait.
The bay was named in 1924 for U.S. Census Bureau employee Ivan Petrof, whose reports of his travels in the late 19th century are a valuable source of Alaska history for that period.
The US Navy aircraft carrier USS Petrof Bay, launched in January 1944, was named after it.