Viktorija Čmilytė (born on August 6, 1983 in Šiauliai) is a Lithuanian chess player with the titles of Woman Grandmaster (WGM) and Grandmaster (GM). She recently won the gold medal at the Women's European Individual Chess Championship in 2011 (Tbilisi). She is a former two-time national champion.

She started playing chess at the age of six, having been taught the moves by her father. She collected many important junior titles, including European Youth Champion for Girls (under 10) (Szombathely 1993) and World Youth Champion for Girls (under 12) (São Lourenço 1995).

On reaching age sixteen, she moved outside the sphere of junior chess, winning the full national championship of Lithuania, held in Vilnius. In order to do so, she had to overcome three male grandmasters and an IM in a tie-break contest, a feat that she repeated five years later in 2005, this time outgunning GM Šarūnas Šulskis in the play-off.

Čmilytė has also enjoyed considerable success at the Women's European Individual Chess Championship, where she captured silver medals in 2003 (Istanbul), 2008 (Plovdiv), and 2010 (Rijeka).

At the Women's World Chess Championship, she has been a serious contender on two occasions. On the first occasion, in 2004, she was defeated in the latter stages by former world champion Maia Chiburdanidze. In 2006, Čmilytė went a step further, eliminating first her Russian rival Alexandra Kosteniuk, then beating Chiburdanidze in the quarter-final. However, she lost in the semi-final to Alisa Galliamova.

In team chess, she has represented Lithuania at most of the major events and is an Olympiad double gold medal winner.