Mary Ann Summers is a fictional character in the television sitcom Gilligan's Island which ran on the CBS network from 1964 to 1967, and has run more or less continuously since in reruns.

She is an ingénue, the typical girl next door, and a foil as well as a friend to glamorous Hollywood star Ginger Grant, played by Tina Louise.

In addition, her practical domestic skills and plain, good, common sense make her an indispensable member of the group.

Mary Ann mentions her mother and father in passing and only very briefly, such as when she tells about her father going bankrupt, before the shipwreck, due to a dishonest business partner, but references her Aunt Martha and Uncle George multiple times, leading some to believe that she lived with them and that her parents may be deceased, another connection to The Wizard of Oz.

In "Two on a Raft", the Honolulu-based AM radio newsreader only states, "the attractive brunette" is "employed at the Winfield General Store".