Kenneth Luke Prokopec (born 23 February 1978) is an Australian former right-handed pitcher who played in Major League Baseball for the Los Angeles Dodgers and Toronto Blue Jays.

While with the Dodgers in 2000 and 2001, the tandem of Prokopec and fellow Australian Jeff Williams gained considerable popularity in the Los Angeles area.

Prokopec was traded to Toronto on 13 December 2001 with Chad Ricketts in exchange for César Izturis and Paul Quantrill.

Prokopec's 2002 tenure with the Toronto Blue Jays was unsuccessful, as he went 2-9 and sustained a labral tear injury late in the season.

In short order, the Blue Jays granted Prokopec free agency in October 2002.