Waller-Bridge grew up in Ealing in west London, and is an alumna of RADA.She attended private sixth form college DLD in Marylebone, London, before making her stage debut in 2009. She is the co-artistic director of DryWrite theatre company. Besides acting, she has also scripted plays, including Good. Clean. Fun. and Fleabag. Waller-Bridge appeared in the second season of drama Broadchurch.