Donald Fred Towsley (born 1949) is an American computer scientist who has been a distinguished university professor in the College of Information and Computer Sciences at the University of Massachusetts Amherst.
His research interests include network measurement, modeling, and analysis.
He is currently the chair of the IFIP Working Group 7.3 on computer performance measurement, modeling, and analysis.
He has also served on numerous editorial boards, including those of IEEE Transactions on Communications and Performance Evaluation.
He has been active in the program committees for numerous conferences, including IEEE Infocom, ACM SIGCOMM, ACM SIGMETRICS, and IFIP Performance conferences for many years, and has served as technical program co-chair for ACM SIGMETRICS and Performance conferences.