Alyson Renae Michalka, credited as Aly Michalka (born March 25, 1989), is an American actress and a singer-songwriter. She is perhaps best known for her role on Phil of the Future as Keely Teslow and as one-half of the pop duo Aly & AJ.

Michalka was born in Torrance, California. She and her sister, Amanda Joy Michalka (who is two years younger), lived and grew up in Seattle, Washington. Michalka has been playing the piano since she was six and started playing the guitar at the age of thirteen. She started acting when she was five years old, mostly in church productions. She and her sister (Amanda Michalka) are both part of the duo "Aly and AJ", they are also best friends.

Michalka's acting debut came when she received the part of Keely Teslow in Disney Channel's Phil of the Future. Michalka later starred in the Disney Channel Original Movie, Now You See It..., in which she plays Allyson Miller, an ambitious television producer who is trying to find the next great young magician.