Kitsap Fast Ferries is a passenger ferry service operating between Seattle and Kitsap County in the U.S. state of Washington. It is funded and operated by Kitsap Transit and began service in July 2017, with a single boat traveling between Seattle and Bremerton. A second route, from Seattle to Kingston, launched in November 2018, and a third route serving Seattle and Southworth began operating in March 2021. In 2023, the system had a ridership of 1,091,400, or about 40,500 per weekday as of the fourth quarter of 2023.

Kitsap County is a county in the U.S. state of Washington. As of the 2020 census, its population was 275,611. Its county seat is Port Orchard; its largest city is Bremerton. The county, formed out of King County and Jefferson County on January 16, 1857, is named for Chief Kitsap of the Suquamish Tribe. Originally named Slaughter County, it was soon renamed.