Sofia Black-D'Elia was born in Clifton, New Jersey. Her mother, Eleanor, works in printing. Her father, Anthony V. D'Elia, is a Judge of the Superior Court of New Jersey. Her father is of Italian descent and her mother is Jewish. She started acting at the age of five and signed up for dancing classes at Broadway Bound.
When she was seventeen, Black-D'Elia was cast in her first major gig on the soap opera All My Children as the recurring character Bailey.
In 2010, she booked the role of Tea on the MTV adaptation of the hit British teen drama Skins, where she plays an openly lesbian teenager. She is featured in Hoodie Allen's music video for "The Chase is On" and plays Allen's love interest in the video.
As of fall 2011, D'Elia had begun classes at The William Esper Studio.
Starting in the fall of 2012, D'Elia played Sage Spence in the sixth and final season of Gossip Girl. She also portrayed Jessie in the Michael Bay-produced time travel thriller Project Almanac, which was released in January 2015.
In 2016, she appeared in the HBO miniseries The Night Of.
|2013||The Immigrant||Not Magda|
|2014||Born of War||Mina|
|2009–10||All My Children||Bailey Wells||28 episodes|
|2011||Skins||Tea Marvelli||Main role, 10 episodes|
|2012||Gossip Girl||Natasha "Sage" Spence||Recurring role, 9 episodes|
|2013||Betrayal||Jules Whitman||Recurring role, 4 episodes|
|2015||The Messengers||Erin Calder||Main role, 13 episodes|
|2016||The Night Of||Andrea Cornish||Episode: "The Beach"|
|2017||The Mick||Sabrina Pemberton||Main role|
|2011||Skins Webisodes||Tea Marvelli||Episodes: "Dress Up", "Poker", "The Big Bust Hunt"|
|2012||Somewhere Road||Erika||Short film|
|2016||10 Crosby||Sofia / Ronnie's Mom||Short film series; Segments: "Hi Fi", "Drunk on Youth"|
|2016||Invisible||Tatiana Ashland||Main role, 5 episodes|