Commutative algebra in the cohomology of groups Three lectures given at the opening conference for the MSRI program in commutative algebra, Sept 9-13, 2002. Dave Benson Department of Mathematics University of Georgia Athens GA 30602 USA Abstract. Commutative algebra is used extensively in the cohomology of groups. In this series of lectures, I shall concentrate on finite groups, but I shall also discuss the cohomology of finite group schemes, compact Lie groups, $p$-compact groups, infinite discrete groups and profinite groups. I describe the role of various concepts from commutative algebra, including finite generation, Krull dimension, depth, associated primes, the Cohen--Macaulay and Gorenstein conditions, local cohomology, Grothendieck's local duality, and Castelnuovo--Mumford regularity.