William B. Magnarelli (born March 20, 1949) is a member of the New York State Assembly, for the 129th district first elected in 1998.

Magnarelli represents the 129th Assembly District, which includes the Northside, Westside, Eastwood and Valley areas of the City of Syracuse, as well as the towns of Geddes and Van Buren.

[1] Magnarelli grew up in Syracuse, attended Our Lady of Pompei School and St. John the Baptist Academy.

He received his bachelor's degree from Syracuse University in 1970, majoring in history.

After graduating, Bill Magnarelli served in the U.S. Army Reserve for six years, attaining the rank of captain.