Madlyn is a given name, and may refer to:
Madlyn Davis (–?), American blues singer Madlyn O'Hare (also Madalyn Murray O'Hair; 1919–1995), American atheist activist Madlyn M. Kahr (1913–2004), American art historian, and educator Madlyn Rhue (1935–2003), American film and television actress
See also Madelyn (given name)