方镛钦（英文名：Dennis Fong，亦以游戏ID名“Thresh”为人所知，1977年－），香港生人，美籍华人企业家，前职业玩家。作为一个职业玩家，他于1997年的雷神之锤锦标赛中赢得了约翰·卡马克的法拉利328轿车，被称为“电子游戏的迈克尔·乔丹”，且在ESEA联盟的“史上最佳北美电子竞技偶像”排行榜上跻身榜首；作为一个企业家，他是Xfire、Lithium的创始人之一，并曾入围《红鲱鱼》（Red Herring）杂志“35岁以下的前20名企业家”排行榜。

Dennis "Thresh" Fong (traditional Chinese:方鏞欽; simplified Chinese:方镛钦; pinyin:Fong Yong Qin; Jyutping:fong1 yung4 jam1) (born March 11, 1977) is an American businessperson, entrepreneur, and retired professional player of the first-person shooter video games Quake and Doom. He is a co-founder of Xfire, an instant messenger and social networking site for gamers which was acquired by Viacom for US$102 million in April 2006. He also co-founded Lithium Technologies, a leading Social customer relationship management (CRM) company. In his playing career his highest profile victory came in 1997 at the Red Annihilation Quake tournament, where he placed first and won id Software CEO John D. Carmack's Ferrari 328. Fong is recognized by the Guinness Book of World Records as the first professional gamer.