Mary Adelaide Lundby (February 2, 1948 – January 17, 2009) was a state Senator from the Iowa's 18th District.

Prior to her election to the Iowa House, Lundby had served as the co-chair of the Linn County Republican party, as a member of the Linn County Republican Central Committee, and as staff assistant to then-senator Roger Jepsen.

She graduated from Upper Iowa University, majoring in Political Science and History.

Lundby was re-elected in 2004 with 20,686 votes (60%), defeating Democratic opponent Lorna Richards.

[1] Her son, Daniel Lundby, was elected to the Iowa House of Representatives in 2012 as a Democrat.