Atticus Matthew Cowper Ross (born 16 January 1968) is an English musician, songwriter, record producer, composer, and audio engineer. Along with Trent Reznor, Ross won the Academy Award for Best Original Score for The Social Network in 2010. In 2013, the pair won a Grammy Award for Best Score Soundtrack for Visual Media for their soundtrack to The Girl with the Dragon Tattoo. In 2021, Reznor, Ross, and Jon Batiste won the Golden Globe & the Academy Awards for the soundtrack for Pixar's Soul.
Ross began working with Reznor in 2002, first on his erstwhile side-project Tapeworm. He later worked with Nine Inch Nails, first as a programmer and producer starting in 2005, and became an official member of the band in 2016.