S. J. "Skid" Simon (1904 – 27 July 1948), born Seca Jascha Skidelsky, was a British fiction writer and bridge player. From 1937 until his death he collaborated with Caryl Brahms on a series of comic novels and short stories, mostly with a background of ballet or of English history. As a bridge expert he was jointly responsible for developing the Acol system of bidding.