Martin Smeby (8 September 1891 - 1 February 1975) was a Norwegian politician for the Labour Party.
He was born in Søndre Land.
He was elected to the Norwegian Parliament from Oppland in 1936, and was re-elected on four occasions. He had previously served in the position of deputy representative during the term 1928 - 1930.
Smeby became a member of Søndre Land municipality council in 1919. He soon became deputy mayor, a position he held in 1922 - 1925 and 1937 - 1939. He served as mayor in 1928 - 1931, 1931 - 1933, 1940 and 1945.