Marimanti is a small market town in Tharaka South subcounty, of Tharaka-Nithi County, Kenya.

The town formerly served as the Headquarters of Tharaka District, which was scrapped after the 2010 Constitution which replaced provincial administrative units with counties.

River Kathita flows past the town.

[3] In 2022, merchants at the Marimanti market organized a tax strike to protest the county government's failure to maintain toilet facilities at the market.

[4] Facilities include Marimanti Hospital with a staff of 160.