Phoebe Dynevor was born in Manchester to actress Sally Dynevor and writer Tim Dynevor. She has a younger brother Samuel and a younger sister Harriet. She attended Cheadle Hulme School where she gained an A and two Bs in her A Levels.
In 2009 Dynevor landed her first role as Siobhan Mailey in the fifth seriesof Waterloo Road. She has also made appearances in several British dramas such as Monroe and The Musketeers.
She had a supporting role in both series of Prisoners' Wives as a gangster's daughter Lauren. In 2014 she appeared in the second series of The Village and from 2015–2016 she played Martha Cratchit in Dickensian.
In 2016 it was announced that Dynevor would be starring alongside Luke Pasqualino and Rupert Grint in Crackle's Snatch. The series was released on 16th March 2017 and was later renewed for a second series.