Maisie (rarely: Maisy) is a feminine given name, long used in Scotland (since at least the 16th century) as a diminutive of Margaret. Notable people with the name include:
Maisie Shiell (1916–2008), Canadian anti-nuclear activist
Maisie Smith (born 2001), English child actress
Maisie Ward (1889–1975), British writer, publisher and speaker
Maisie Williams (born 1997), British actress
Fictional characters:
Maisie, a kindhearted showgirl in ten films and a radio show
Maisie, in the British comic strip The Perishers
the title character of Maisie Raine, a 1998-1999 British television drama series
Maisie Wylde, in the soap opera Emmerdale
Maisie MacKenzie, the kitten in the Scottish children's books by Aileen Paterson and (as Maisie Mac) in the animated broadcast Meeow!
Maisy Mouse, fictional mouse in a picture book series and a Nickelodeon animated series
Mayzie, a character in Dr. Seuss children's books.