Irving Lefkowitz (July 8, 1921 - June 21, 2015) was an American control engineer and Professor Emeritus at Case Western Reserve University who made significant contributions to process dynamics, advanced control, and computer-based integrated and hierarchical systems control. He began his career in the industry working for Seagram, first in Baltimore, and later in Louisville, where he became director of corporate instrumentation and control research.
Lefkowitz was a Life Fellow of the IEEE Control Systems Society, and a recipient of the Richard E. Bellman Control Heritage Award (1982).