Simon Jacoblivitch Skidelsky (Russian: Семён Яковлевич Скидельский; 4 July 1904 – 27 July 1948), also known as S. J. "Skid" Simon, Seca Jascha Skidelsky, and Simon Jasha Skidelsky, was a British journalist, 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.