Sebastian Weyer (pronounced /ˈvaɪ.ər/, 4 December 1997) is a German Rubik's Cube speedsolver who specializes in 4x4x4 solving.

Weyer held the world record for the single 4x4x4 solve from 15 September 2019 to 26 November 2021, with a time of 17.42 seconds set in the Danish Open 2019.

[2] Weyer holds the European record for average of five 4x4x4 solves, being 21.46 seconds.

At the 2013 World Championship in Las Vegas, Weyer placed 2nd in 4x4x4 and 3rd in 3x3x3.

[4] At the 2017 World Championship in Paris, Weyer won the 4x4x4 event.