David Allen is a British professional boxer. At regional level, he has challenged twice for the Commonwealth heavyweight title in 2017 and 2018. He holds a notable win over former world heavyweight champion Lucas Browne.

Allen started his professional career with a six-round points win over Rolandas Cesna in 2012.

After being undefeated in his first 10 professional fights, he fought Dillian Whyte in July 2016 at short notice for the vacant WBC International heavyweight title, losing by unanimous points decision over ten rounds.

In December 2016, he fought undefeated Luis Ortiz (26–0) on the undercard of Anthony Joshua vs. Éric Molina, losing by seventh-round stoppage.

He fought Lenroy Thomas in May 2017 for the vacant Commonwealth heavyweight title, losing a split decision over 12 rounds.

Their rematch in March 2018 was declared a technical draw after Allen suffered a bad cut over the right eye in the first round.

Two fights later, Allen travelled to Paris to face undefeated Olympic gold medalist Tony Yoka (4–0), but was unsuccessful in a 10th-round technical knockout loss.

The biggest win of Allen's career came in a third-round knockout of former WBA (Regular) champion Lucas Browne in April 2019.