Bernard Germain Étienne de la Ville, Comte de Lacépède (December 26, 1756 – October 6, 1825) was a French naturalist.

He was born at Agen in Guienne. His education was carefully conducted by his father, and the early perusal of Buffon's Natural History awakened his interest in that branch of study, which absorbed his chief attention. His leisure he devoted to music, in which, besides becoming a good performer on the piano and organ, he acquired considerable mastery of composition, two of his operas (which were never published) meeting with the high approval of Gluck; in 1781–1785 he also brought out in two volumes his Politique de la musique. Meantime he wrote two treatises, Essai sur l'électricité (1781) and Physique générale et particulaire (1782–1784), which gained him the friendship of Buffon, who in 1785 appointed him subdemonstrator in the Jardin du Roi, and proposed that he continue Buffon's Histoire naturelle. This continuation was published under the titles Histoire des quadrupèdes, ovipares et des serpents (2 vols., 1788–1789) and Histoire naturelle des reptiles (1789).

After the French Revolution Lacépède became a member of the legislative assembly, but during the Reign of Terror he left Paris, his life having become endangered by his disapproval of the massacres. When the Jardin du Roi was reorganized as the Jardin des Plantes, Lacépède was appointed to the chair allocated to the study of reptiles and fishes. In 1798 he published the first volume of Histoire naturelle des poissons, the fifth volume appearing in 1803, and in 1804 appeared his Histoire des cétacés. From this period until his death the part he took in politics prevented him making any further contribution of importance to science. In 1799 he became a senator, in 1801 president of the senate, in 1803 grand chancellor of the legion of honor, in 1804 minister of state, and at the Restoration in 1819 he was created a peer of France. He died at Epinay. During the latter part of his life he wrote Histoire générale physique et civile de l'Europe, published posthumously in 18 volumes, 1826.