Feliks Zemdegs is of Latvian descent and his maternal grandmother is Lithuanian.

Zemdegs attended St Kevin's College, Toorak and graduated in 2013 with a perfect study score in VCE English and an ATAR of 99.90. Zemdegs has a Bachelor of Commerce from the University of Melbourne, majoring in economics, with a breadth study track in mechanical engineering.

He is an Australian Rubik's Cube speedsolver and one of the only two speedcubers ever to win the World Cube Association World Championship twice (the other being Max Park), winning in 2013 and 2015, and is widely considered the most successful and greatest speedcuber of all time.