The Sip 'n Dip Lounge is a tiki bar in Great Falls, Montana, US, opened in 1962, when Polynesian themes were popular. It has survived to the present day with its tiki theme intact. Located inside a local motel that was considered modern and trendy at the time it was built, the Sip 'n Dip is known for having people dressed as mermaids swimming underwater in an indoor swimming pool visible through a window in the bar. Decorated with a bamboo ceiling and a South Seas theme, the bar featured Patricia "Piano Pat" Sponheim, noted for her unique "jazzy" style, who played piano there from 1963 until her death in May 2021.