Thabit () is an Arabic name for males that means "the imperturbable one". It is sometimes spelled Thabet.
People with the patronymic Ibn Thabit, Libyan hip-hop musician Asim ibn Thabit (died 625), companion of Muhammad Hassan ibn Sabit (died 674), poet and companion of Muhammad Khuzaima ibn Thabit (died 657), companion of Muhammad Sinan ibn Thabit (880–943), physician and mathematician Zayd ibn Thabit (610–660), personal scribe of Muhammad Abdullah Thabit (born 1973), Saudi Arabian poet, novelist and journalist
People with the given name Thabit ibn Qays, companion of Muhammad Thabit ibn Qurra (826–901), Baghdadi mathematician and astronomer
See also Thabit number Tabit (town) (or Thabit), Sudan Upsilon Orionis or Thabit – a star in the constellation Orion Sabit, the Turkish equivalent of Thabit