Camille Guillaume Bigourdan (French pronunciation: [kamil gijom biguʁdɑ̃]; 6 April 1851 – 28 February 1932) was a French astronomer. Bigourdan was born at Sistels, Tarn-et-Garonne to Pierre Bigourdan and Jeanne Carrière. In 1877 he was appointed by Félix Tisserand as assistant astronomer at the Toulouse Observatory, and in 1879 followed Tisserand to the Paris Observatory when the latter became director there. He described a method for adjusting equatorial mount telescopes, which was known as "". He married a daughter of Amédée Mouchez.