USCGC Katmai Bay (WTGB-101) is a United States Coast Guard Cutter, and the lead ship of the Bay-class of icebreaking tugboats.

At 140 ft (43 m), she is designed to have greater multi-mission capabilities than the 110' Calumet-class Harbor Tug (WYTM).

She is homeported in Sault Ste Marie, Michigan, operating in support of the much larger USCGC Mackinaw (WLBB-30).

Katmai Bay, namesake of an area of saltwater shoreline in the Katmai National Park and Preserve of Alaska, is the lead ship of a class of icebreaking tugboats designed to have greater multi-mission capabilities than the 110' Calumet-class Harbor Tug (WYTM).

This article about a specific ship or boat of the United States Armed Forces is a stub.