Michael Kenneth Christian Grigsby (7 June 1936 – 12 March 2013) was an English documentary filmmaker.

With a filmography spanning six decades and nearly 30 films, Grigsby occupies a unique position in British documentary filmmaking, having witnessed and commented on many of the dramatic changes in British society (and beyond) from the late 1950s into the next century. As a critic noted, "from Michael Grigsby back to John Grierson runs an unbroken tradition in British documentary-making: a passionate commitment to the poetry of everyday life."