Mary Mosiman (born February 13, 1962) is an American politician who served as the 32nd State Auditor of Iowa. A Republican, she was appointed by Governor Terry Branstad to the position of Auditor of State on May 13, 2013, filling a vacancy created when David A. Vaudt resigned. She was elected to a full term of office in 2014. She was defeated by Democrat Rob Sand in 2018. Previously, she had served as Story County auditor winning election in 2000 and re-election in 2004 and 2008, and as Deputy Iowa Secretary of State from 2010 to 2013.