Roy F. Schwitters (20 June 1944 – 10 January 2023)[1] was an American physicist, professor of physics at Harvard, Stanford, and finally the University of Texas at Austin.

[3] Schwitters was a researcher involved with the MIT Laboratory for Nuclear Science's Moby Dick project at the Cambridge Electron Accelerator in the late 1960s.

An early major accomplishment in Schwitters' career was to oversee the design and construction of the Cylindrical Wire Spark Chambers of the Mark I (detector) experiment, which operated at the interaction point of the SPEAR collider at the Stanford SLAC Laboratory from 1973 to 1977, and major involvement in the analysis and interpretation of the data that resulted in the discovery of the J/ψ particle (which resulted in the Nobel Prize for Burton Richter in 1976).

Schwitters was director of the Superconducting Super Collider (SSC) in Waxahachie, Texas starting in 1989, and ending in October 1993 when the funding for its construction was terminated by Congress.

Roy Schwitters used muon pair production to measure the polarization of the beams in the electron-positron storage ring SPEAR.