Artem Yurievich Sitak (/ˈɑːrtəm ˈsɪtæk/ ART-əm SIT-ak; Russian: Артём Юрьевич Ситак, romanized: Artyom Sitak; born 8 February 1986) is a Russian-born New Zealand professional tennis player. On 11 August 2008, he reached his highest ATP singles ranking of World No. 299, whilst his highest doubles ranking of World No. 32 was reached on 10 September 2018, after the US Open. He is the younger brother of Dmitri Sitak, who was also a professional tennis player.
Coached during the 1990s by Santini, as a 13-year-old in 1999, Sitak received a wildcard into the main draw of an ITF junior tournament in Russia as a 13-year-old in 1999. He was defeated by Evgeni Smirnov 6–4, 6–1. The following year he entered the qualifying draw of the same tournament, and defeated future ATP top 50 player Denis Istomin 6–0, 6–1 to win his first ITF junior match. Sitak was taken out in the third and final round of qualifying by a future ATP top 100 player Teimuraz Gabashvili 6–4, 7–5.