Steven Dale Ittel (born 1946 in Hamilton, Ohio) is an American chemist specializing in organometallic chemistry and homogeneous catalysis.

He was then commissioned as an officer in the United States Public Health Service and studied photochemical smog in the New York City metropolitan area from 1968 to 1970.

Ittel worked on hydride activation of lanthanides for Systems for Nuclear Auxiliary Power (SNAP) at Monsanto's Mound Laboratories for a short time.

He was responsible for a series of C-H activation reactions based upon fleeting zero-valent iron complexes bearing bidentate phosphorus ligands.

[12] Ittel coauthored the definitive textbook, Homogeneous Catalysis,[13] with George Parshall, and his work is recorded in over 150 citations in Chemical Abstracts.