Rochefourchat (French pronunciation: [ʁɔʃfuʁʃa]; Vivaro-Alpine: Ròchaforchaa) is a commune in the Drôme department, in the Auvergne-Rhône-Alpes region, southeastern France. In the commune there is a single house, the St. Pierre's Church, a converted barn, and the ruins of an old castle. The commune is bordered by four other communes, and nearest to Rochefourchat are Saint-Nazaire-le-Désert, Les Tonils, Pradelle, and Brette.

In 1178, the castle of Rocha Forcha was built by the bishops of Die as a stronghold against the Holy Roman Emperors. It belonged to French lords until the year 1766 when the last one, Lord Rey de Noinville, died. In 1796, a French trader, Pierre Jossaud bought the land surrounding the castle and renamed it Rochefourchat. The commune has been passed down through Jossaud's family.

Historical population

Year	Pop.	±% p.a.
1968	6	—
1975	2	−14.52%
1982	3	+5.96%
1990	2	−4.94%
1999	1	−7.41%
2009	1	+0.00%
2014	1	+0.00%
2020	1	+0.00%
Source: INSEE

The permanent population of Rochefourchat consists of one woman; yet Rochefourchat is not the least populous French commune, as there are six communes with no inhabitants, destroyed and abandoned during World War I but maintained as administrative subdivisions to preserve their memory.

• Communes of the Drôme department
• Monowi, a village consisting of one resident