Cossus may refer to:
Species Cossus, various species of moth Hygrophorus cossus, species of fungus
People Aulus Cornelius Cossus, Roman general Cossus Cornelius Lentulus, multiple people Gnaeus Cornelius Cossus (consular tribune 406 BC), Roman consular tribune Gnaeus Cornelius Cossus (consul 409 BC), Roman consul Publius Cornelius Cossus (consular tribune 415 BC), Roman consular tribune Publius Cornelius Rutilus Cossus, Roman statesman Aulus Cornelius Cossus Arvina, Roman statesman