Algimantas Butnorius (20 February 1946 – 30 October 2017) was a Lithuanian chess grandmaster and world seniors champion in 2007.

[6] In 2010, he tied for 2nd–4th with Vitaly Tseshkovsky and Nikolai Pushkov in the European Seniors' Rapid Championship.

[7] Butnorius was awarded the International Master title in 1983 and the Grandmaster title in 2007, as a result of winning the World Senior Chess Championship.

Butnorius studied journalism at Vilnius University, graduating in 1973.

He also contributed chess-related articles and chess problems to Jaunimo Gretos, Kauno Tiesa, Komunizmo Vėliava, Lietuvos Aidas, Kauno Diena, and Vakarinis Kaunas.