George Sotiropoulos (born 9 July 1977) is an Australian former professional mixed martial artist who most notably fought in the Ultimate Fighting Championship (UFC) in their Lightweight division.

[5] Sotiropoulos grew up in Geelong, Victoria, changing schools multiple times due to occasional physical altercations he got into.

[6] Despite the scuffles, Sotiropoulos fared well in his studies and got his associate's diploma in international trade from Victoria University, Melbourne.

[17] Sotiropoulos defeated Roman Mitichyan at UFC Fight Night 13 on 2 April 2008 by TKO in the second round.

[18] He was scheduled to fight judoka Karo Parisyan at UFC 87, however Sotiropoulos was forced to withdraw due to injury.

[19][20] After an 18-month break in his career, Sotiropoulos switched weight classes, and was expected to face Rob Emerson at UFC 101 on 8 August 2009.

[23] Sotiropoulos defeated Ultimate Fighter 9 alumni Jason Dent in the second round via armbar submission on 21 November 2009, at UFC 106.

[24] In a post-fight interview following the win, Sotiropoulos stated his desire to compete at the UFC 110 card, in Sydney, Australia.

[40] In July 2012 Sotiropoulos was confirmed as the Australian coach for The Ultimate Fighter: The Smashes, and faced Ross Pearson on 15 December 2012 at the finale - UFC on FX 6.

[48] Almost a decade removed from his previous bout, Sotiropoulos faced Josh Togo at HEX Fight Series 26 on 26 May 2023.

[49] The bout ended in a no contest in the second round after an accidental eye poke rendered Togo unable to continue.

[50] Sotiropoulous is featured in UFC Undisputed 3 as a Lightweight fighter alongside the likes of Clay Guida, Dennis Siver, Joe Lauzon and Frankie Edgar.