Madelyn
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Madelyn or Madalyn is a feminine first name, a variant of Madeline or Madeleine. Notable people with these names include:
Madelyn
- Madelyn Clare (1894–1975), American actress
 - Madelyn Cline (born 1997), American actress
 - Maddy Curley (born 1981), American actress
 - Madelyn Desiano (born 2000), American soccer player
 - Madelyn Deutch (born 1991), American actress
 - Madelyn Dunham (1922–2008), maternal grandmother of Barack Obama
 - Madelyn Pugh (1921–2011), American television writer who worked on the I Love Lucy television series
 - Madelyn Renee (born 1955), American soprano formerly known as Madelyn Renée Monti
 - Madelyn Rosenberg (born 1966), American author
 
Madalyn
- Madalyn Aslan (born 1963), American-British writer, astrologer, and palmist
 - Madalyn Godby (born 1992), American track cyclist
 - Madalyn Murray O'Hair (1919–1995), American writer and activist
 - Madalyn Schiffel (born 1994), American soccer goalkeeper
 
Fictional characters
- Madelyn "Maddie" Hayes, in the television series Moonlighting
 - Madelyn Stillwell, in the television series The Boys and The Boys Presents: Diabolical
 - Madelyn Spaulding, a villain from Static Shock