Zacharias Martin Aagaard (13 October 1863 – 1913), was a Norwegian painter. Aagaard specialized as marine painting.
Martin Aagaard was born in Levanger in Nord-Trøndelag county, Norway. He was educated at Trondheim Technical School and the Royal Drawing School in Oslo. He was a student of Harriet Backer and Knud Bergslien. Additionally he apprenticed for a time with Christian Krohg. He spent time researching locations in Lofoten and Finnmark.
He exhibited his works from 1898 in Bergen. He exhibited at the Exposition Universelle (1900). Several of his paintings were executed in large dimensions. In 1909, Aagaard was in Trondheim, where he painted a large painting from the harbor featuring pleasure crafts. His work is on public display at the Bergen Maritime Museum, Nordmøre Museum, and Trondheim Maritime Museum among other locations.