Arnold Billy Allen (born 22 January 1994) is an English professional mixed martial artist.

[4] Born and raised in Suffolk, Allen began training in mixed martial arts as a teenager and took part in several amateur fights before turning professional in 2012.

[3] He made his professional debut competing as a featherweight for various regional promotions across Great Britain, including a stint in Cage Warriors.

[citation needed] After his TKO stoppage of Paul Cook in November 2014, Allen signed with the UFC.

[5] Allen made his promotional debut on 20 June 2015 as a short notice replacement filling in for an injured Mike Wilkinson against Alan Omer at UFC Fight Night 69.

[15] However, Allen was pulled from the fight on 11 January due to alleged visa issues which restricted his ability to travel.

[20] Allen was expected to face Gilbert Melendez on 30 November 2018 at The Ultimate Fighter 28 Finale.

[22] In turn, Allen pulled out of the fight on 16 November citing a cut he received while training.

Allen was scheduled to face Jeremy Stephens on 7 November 2020 at UFC on ESPN: Santos vs.

[46] Allen was issued a five-month suspended sentence after he pleaded guilty to affray, for his role in a 23 December 2016 brawl near Ipswich which left a man and five women injured.