Walter Gordon (13 August 1893 – 24 December 1939) was a German theoretical physicist.
In 1900, he attended school in St. Gallen and in 1915 he began his studies of mathematics and physics at University of Berlin.
In 1922, while still at the University of Berlin, Gordon became the assistant of Max von Laue.
In 1925, he worked for some months in Manchester with William Lawrence Bragg and later, at the Kaiser Wilhelm Society for fiber chemistry in Berlin.
Oskar Klein and Walter Gordon proposed the Klein–Gordon equation to describe quantum particles in the framework of relativity.