Lev Borisovich Psakhis (Hebrew: לב בוריסוביץ' פסחיס; Russian: Лев Борисович Псахис; born 29 November 1958) is an Israeli chess grandmaster, trainer and author.

In international tournaments, he has had many fine results, including outright or shared first place at Nałęczów 1980,[1] Sarajevo 1981,[2] Cienfuegos 1983,[3] Troon 1984,[4] Sverdlovsk 1984,[5] Szirak 1986, Sarajevo 1986,[6] Sevastopol 1986, Lugano Open 1988, Tel Aviv 1990 (and again in 1999), London MSO 1999, and Andorra 2002.

In the World Championship cycle, he was a runner-up at the Erevan Zonal of 1982 and qualified for the Interzonal at Las Palmas later the same year.

Over the years, he has assisted in many training programs, dating back to the late 1980s when he worked with Kasparov and Artur Yusupov.

Other students and famous chess players whom he has seconded include Susan Polgar, Judit Polgár,[11] Daniel Naroditsky, [12] and Emil Sutovsky.