Madelyn is a first name. Notable people with the name include:
Madelyn Clare (1894–1975), American actress
Madelyn Dunham (1922–2008), the American maternal grandmother of Barack Obama
Madelyn Pugh (1921–2011), television writer who worked on the I Love Lucy television series
Madelyn Renee, American soprano formerly known as Madelyn Renée Monti
Madelyn Vega, Puerto Rican journalist and attorney
Madelyn Lugo, Puerto Rican author and psychotherapist
Other uses
"Madelyn", a song by The Wonder Years from The Greatest Generation