Fert may refer to:

• Albert Fert, a French physicist who enabled a breakthrough in gigabyte hard disk drives.

• FERT, the motto of the former Italian Royal House of Savoy and Kingdom of Italy

• The acrophonic name of the letter Ef (Cyrillic) in the old Russian alphabet

• A very weak opening bid in the game of contract bridge (short for fertiliser), used in strong pass systems; see Glossary of contract bridge terms#fert