Le Blanc-Mesnil (French pronunciation: [lə blɑ̃ menil] ⓘ) is a commune in the northeastern suburbs of Paris, France.

This name is a compound of Medieval Latin Mansionile, meaning 'little houses', from Latin mansio (accusative mansionem), and of Germanic (Old Frankish) blanch, blaun, meaning 'glossy, shining, white', which gave French blanc ('white') and English blank.

The name is interpreted by some as a reference to the houses of Le Blanc-Mesnil which were whitened due to the flour dust coming from the windmills located there in ancient times.

A discovery in 1984 concerning archeological excavation found three polished axes and modified flint attests a human presence in Le Blanc-Mesnil in the Neolithic period and the Gallo-Roman era.

[4] The Morée and Molette rivers nearby and the existence of an ancient Roman road support this theory.