Marcus Junius Homullus was a Roman senator active in the late 1st and early 2nd centuries AD, who occupied a number of offices in the imperial service. He also served as suffect consul for the nundinium of September to December 102 as the colleague of Lucius Antonius Albus. Bernard Rémy notes that his cognomen, "Homullus", appears primarily in Italy, so this may be where his origins lie. Homullus may have been the M. Junius who was pontifex in the year 101-102, whose calator was M. Junius Epaphroditus.