Marion is a city in and the county seat of Marion County, Ohio, United States. The municipality is located in north-central Ohio, approximately 50 miles (80 km) north of Columbus.

The population was 36,837 at the 2010 census. According to the US Census 2008 estimate Ohio's Columbus–Marion–Chillicothe Combined Statistical Area has 2,002,604 people. Marion is the county's largest city and the center of the Marion Micropolitan Statistical Area (as defined by the United States Census Bureau in 2003). President Warren G. Harding, a former owner of the Marion Star, was a resident of Marion for much of his adult life.

The city and its development were closely related to industrialist Edward Huber and his extensive business interests. The city is home to several historic properties, some listed on the National Register of Historic Places listings in Marion County, Ohio.

The current mayor of Marion is Scott Schertzer.

Marion was laid out in 1822, and is named in honor of General Francis Marion.

Marion was one of Ohio's major industrial centers until the 1970s. Products of the Marion Steam Shovel Company (later Marion Power Shovel) built the Panama Canal and in the 1960s, NASA contracted with Power Shovel to construct the crawler-transporters that moved the assembled Saturn V rockets, used by Project Apollo, to the launch pad. In 1911, 80% of the nation's steam shovel and heavy duty earth moving equipment was manufactured in Marion, Ohio.

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