Alan S. Robertson (born April 10, 1941) is an American lawyer, and retired Republican politician and judge.
In 1971, four-term incumbent state representative John Q. Radcliffe resigned to accept a role in the new governor's administration.
In 1979, another opportunity in the legislature presented itself when incumbent state representative Steve Gunderson resigned his seat to accept a role on the staff of congressman Toby Roth.
He ultimately won one more term in the assembly, narrowly defeating Democrat Rodney C. Moen in 1980, before losing re-election in 1982 to Barbara Gronemus after redistricting.
Robertson resumed his law practice, but returned to public service one more time, in 1994, when Governor Tommy Thompson appointed him to the Wisconsin circuit court in Tremplealeau County to fill the vacancy created by the resignation of Judge Richard Galstad.