Romorantin-Lanthenay (French pronunciation: [ʁɔmɔʁɑ̃tɛ̃ lɑ̃tənɛ] ⓘ), commonly known as Romorantin, is a commune and town in the Loir-et-Cher department, administrative region of Centre-Val de Loire, France.

The population data given in the table and graph below for 1954 and earlier refer to the former commune of Romorantin.

Every year during the last weekend in October, a gastronomy festival is held in Romorantin.

First held in 1978, "Les Journées Gastronomiques de Sologne" now attracts around 13,000 visitors.

Davy Jeanney, a two-time winner in the World Rallycross Championship, lives in Romorantin-Lanthenay.