Walter Moritz Boas FAA (10 February 1904 – 12 May 1982) was a German-Australian metallurgist.
Boas was born in Berlin, Germany and was educated at the Berlin Institute of Technology (Dip. Engin. 1928, Dr.-Ing. 1930). After several positions at German and Swiss institutions, Boas became a lecturer in metallurgy at University of Melbourne in 1938; then from 1940 to 1947, senior lecturer. From 1947 to 1949, Boas was principal research officer, CSIR Division of Tribophysics; and from 1949 to 1969 chief of the division.
The Walter Boas Medal of the Australian Institute of Physics is named in his honour.