Marcus Licinius Crassus (fl. 1st century BC), grandson of the triumvir Marcus Licinius Crassus, was a Roman consul in the year 30 BC as the colleague of Octavian (the future Roman Emperor Augustus). He was best known for his successful campaigns in Macedonia and Thrace in 29–27 BC, for which he was denied customary military honors by Augustus.
The younger Crassus was the son of another Marcus Licinius Crassus, possibly by his wife Caecilia Metella Cretica, daughter of the consul Quintus Caecilius Metellus Creticus (see Caecilius Metellus); his mother's tomb is visible on the Appian Way. His father was a quaestor to Julius Caesar, and a son of Marcus Licinius Crassus possibly by his wife Tertulla (widow of an elder brother killed in December 87 BC). Crassus apparently had no surviving sons by his wife. It is believed that he adopted the future consul Marcus Licinius Crassus Frugi from the Calpurnii Pisones family.