Aloyzas Kveinys (9 July 1962 – 26 July 2018^[1]) was a Lithuanian chess player who was awarded the Grandmaster title in 1992.

Kveinys was awarded the Soviet Master of Sport title for chess in 1981. He won the Lithuanian championship 5 times: in 1983 (shared with Eduardas Rozentalis),^[2] 1986,^[3] 2001 (shared with Šarūnas Šulskis), 2008 and 2012.^[4] In 2010 he won a tournament in Moss, Norway.^[5] In March 2013 he won the Mallorca Masters. In 2016 he won the Chess Festival in Bad Wörishofen.^[6] He was awarded the FIDE titles of International Master in 1990 and Grandmaster in 1992. He was a graduate of the chess department of the Moscow Institute of Physical Culture and Sports (now Russian State University of Physical Education, Sport, Youth and Tourism).^[7]

Kveinys has played for Lithuania in 8 Chess Olympiads:^[8]

• In 1992, at fourth board in the 30th Chess Olympiad in Manila (+4 −4 =6)
• In 1994, at third board in the 31st Chess Olympiad in Moscow (+3 −3 =5)
• In 1996, at fourth board in the 32nd Chess Olympiad in Erevan (+4 −4 =2)
• In 2000, at first board in the 34th Chess Olympiad in Istanbul (+3 −2 =8)
• In 2002, at fourth board in the 35th Chess Olympiad in Bled (+7 −3 =4)
• In 2004, at third board in the 36th Chess Olympiad in Calvia (+3 −3 =6)
• In 2006, at second board in the 37th Chess Olympiad in Turin (+4 −0 =8)
• In 2008, at first board in the 38th Chess Olympiad in Dresden (+1 −4 =6)

He has also represented Lithuania in 5 European Team Chess Championships:^[9]

• In 1992, at second board in the 10th European Team Chess Championship in Debrecen (+2 −2 =5);
• In 2003, at first board in the 14th European Team Chess Championship in Plovdiv (+2 −2 =4);
• In 2005, at third board in the 15th European Team Chess Championship in Gothenburg (+1 −0 =8);
• In 2007, at third board in the 16th European Team Chess Championship in Heraklion (+3 −3 =2);
• In 2015, at first board in the 19th European Team Chess Championship in Warsaw (+3 −4 =2).