Billy Magoulias (born 23 January 1997) is a Greece international rugby league footballer who plays as a lock for the Newtown Jets in the NSW Cup.

Magoulias played for Newtown in the Intrust Super Premiership NSW 18–12 grand final defeat against Canterbury-Bankstown at Leichhardt Oval.

[5][6] Magoulias played for Newtown in their 2019 Canterbury Cup NSW grand final victory over Wentworthville at the Western Sydney Stadium.

[8] The following week in the NRL State Championship final at ANZ Stadium, Magoulias set up the winning try with just five seconds of normal time remaining.

[14] On 29 September, he played for Newtown in their 2024 NSW Cup Grand Final victory over North Sydney, he came up with a vital try assist to forward Jordan Leiu.