Blas de Videla Páez (c. 1785–28 march 1831) was an Argentine soldier and Unitarian politician. He was born into a wealthy family of merchants and landowners in San Luis Province. In 1803 he became a lieutenant in a volunteer regiment of the provincial cavalry. In 1806 he marched to Buenos Aires under the command of the viceroy Rafael de Sobremonte to fight against the British invasion. Though he arrived too late to join in the reconquest of the city, he aided in the defense of the city the following year.