The MacKinnon Apartments are a historic apartment building at 236 Third Street in Juneau, Alaska. It is a three story wood frame structure, finished in stucco, with corner quoining and a dentillated cornice. When originally built in 1925, it was 80 feet (24 m) long and housed six single-bedroom and 12 studio apartments. In 1959 another 20 feet (6.1 m) were added, housing another five studio units. The building is a representative of Juneau's boom years in the 1920s, when the local gold rush peaked.

The building was listed on the National Register of Historic Places in 2000.