Barbara Bluestein Simons (born January 26, 1941) is an American computer scientist and the former president of the Association for Computing Machinery (ACM). She is a Ph.D. graduate of the University of California, Berkeley and spent her early career working as an IBM researcher. She is the founder and former co-chair of USACM, the ACM U.S. Public Policy Council. Her main areas of research are compiler optimization, scheduling theory and algorithm analysis and design.