Amanda Joy Michalka (born April 10, 1991) is an American actress, voice actress, singer, and musician.

She is best known as one half of the musical duo Aly & AJ (briefly 78violet), alongside her sister Aly Michalka. She has appeared in films such as The Lovely Bones (2008), Secretariat (2010), Super 8 (2011), Grace Unplugged (2013), Weepah Way for Now (2015), and Support the Girls (2018). Michalka also starred in the ABC sitcom The Goldbergs (2013–present) and its spin-off series Schooled (2019–2020). She is also known for voicing a lead role as Catra in the Netflix animated adventure series She-Ra and the Princesses of Power (2018–2020).