Mairin or Máirín may refer to

People Máirín Cregan (1891–1975), an Irish nationalist and writer Mairin Mitchell (1895–1986), an Anglo-Irish writer Máirín de Burca (born 1938), an Irish journalist Máirín Ní Ghadhra, an Irish broadcaster Máirín Nic Eoin, an Irish academic Other Betulinic acid (alternative name)