- Younger brother of pop star Lily Allen.
- The subject of the song "Alfie", final track on his sister Lily Allen's debut album "Alright, Still".
- In a relationship with American DJ and model Allie Teilz since 2016, Allen announced the birth of their daughter Arrow via his Instagram account on October 22, 2018.
- Good friends with Game of Thrones (2011) co-stars Iwan Rheon, Kit Harington, and Richard Madden.
- Son of Keith Allen and Alison Owen.
- He is of Welsh, English, and Irish descent.
- Nephew of Kevin Allen.
- Born on the same date as Emmy Rossum.
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