Billy Clifford (born 18 October 1992) is an English footballer who plays as a midfielder for National League club Barnet.

He played in Chelsea's pre-season friendly away to Ajax, and on 18 October, he joined the first team for an away Champions League game against Spartak Moscow, where he was an unused substitute.

[2] On 19 March 2012, Clifford made headlines when he, along with Jacob Mellis, set off a smoke grenade and caused an evacuation of the club's Cobham training ground.

The pair escaped with a fine after admitting he brought the grenade – understood to be from a paintball expedition – into Chelsea's Cobham training headquarters.

[17] On 30 January 2014, Clifford was loaned for the rest of the season to Belgian club Royal Antwerp, then managed by former Chelsea striker Jimmy Floyd Hasselbaink.

[25] A week later, manager Dermot Drummy gave Clifford his first Crawley start in a 1–1 draw against Doncaster Rovers, in which he featured up until the 70th minute before being replaced by Bobson Bawling.

[29] After featuring as an unused substitute on two occasions whilst back at Boreham Wood, Clifford opted to join National League South side Hemel Hempstead Town and went on to make his debut in a 2–0 loss against Woking in August 2018.