Michael O'Shea was known as an American actor who appeared in feature films and later in television and whose career spanned the 1940s, 1950s, and 1960s.

The Eve of St Mark is a 1942 play by Maxwell Anderson set during World War II. It later became a 1944 film by 20th Century Fox that featured some of the same actors who repeated their roles in the film. The title is derived from the legend of St. Mark's Eve and the title of an uncompleted 1819 poem by John Keats.