John Collins (1835 – April 22, 1903) was an Irish-American businessman who served as the fourth elected mayor of Seattle, Washington.

Collins was born in County Cavan, Ireland and emigrated to the United States at age 10, settling in New York, before moving first to Maine, and then to Port Gamble, Washington to work at the Puget Sound Mill Company.

Arriving in Seattle in the 1865, he successfully invested in a number of industrial concerns, including the Talbot coal mine, and the Seattle Gas Light Company, and purchased and ran the city's Occidental Hotel.

He was notable for being a "rare Catholic Democrat among the city's Protestant Republican ruling class".

In 1881, Collins performed the duties of "acting mayor" for a month, during which time he signed a municipal water supply-related ordinance into law.