Louis Hasselmans (25 July 1878 – 27 December 1957) was a French cellist and conductor.

He latter conducted the Opéra-Comique (1909–1911 - 1919–1922), the Montreal orchestra, the "Concerts classiques de Marseille" (1911–1913) and the Civic Opera House of Chicago (1918–1919).

Called by Castelbon de Beauxhostes, under the advice of Camille Saint-Saëns, he conducted Parysatis and Héliogabale at the Théâtre des Arènes [fr] in Béziers in 1902 and 1910.

Louis Hasselmans was the dedicatee of the Cello sonata No 1 by Gabriel Fauré.

Louis Hasselmans married the American mezzo-soprano Minnie Egener (1881–1938).