Daniel Lazard (born December 10, 1941) is a French mathematician and computer scientist. He is emeritus professor at Université Pierre et Marie Curie.
Lazard was born in Carpentras. He began his academic career by working in commutative algebra, especially on flat modules. Around 1970, he began to work in computer algebra, which, soon after, became his main research area. In this field, he is specially interested in multivariate polynomials and more generally in computational algebraic geometry, with emphasis on polynomial system solving.
One of his students is Jean-Charles Faugère.