Gyula Sax (18 June 1951 – 25 January 2014)[1] was a Hungarian chess grandmaster and International Arbiter (1995).

Sax placed first at Rovinj–Zagreb 1975, Vinkovci 1976, Las Palmas Invitation (together with Vladimir Tukmakov) 1978, IBM international chess tournament 1979 (together with Vlastimil Hort), and Wijk aan Zee 1989 (shared in a four-way tie).

Sax participated twice in a row in the Candidates Tournament – after qualifying at the Subotica Interzonal in 1987 and at the Manila Interzonal in 1990 respectively – but was eliminated in the Candidates in 1988 by Nigel Short (+0=3-2) and in 1991, after 'extra time', by the then sixty-year-old Viktor Korchnoi (+1=6-1; +0=1-1 rapid chess).

[2] Judit Polgár paid tribute to him shortly after his death: Gyula Sax was one of the greatest chess players of Hungary.

He was ready to analyze positions with me, and shared ideas and by doing so he gave me a lot of self-confidence.