Sydney Scholefield Allen QC (3 January 1898 – 26 March 1974) was a British barrister and Labour Party politician.

He served with the Royal Artillery during the First World War, and subsequently was called to the Bar at Gray's Inn.

Practising in criminal law, his most famous brief was the sensational 1931 Liverpool murder case, acting as junior counsel for William Herbert Wallace, assisting Roland Oliver KC, who led for the Defence.

He was married to Mona (née Irving) and they had two sons, John (advisor to Harold Wilson) and David.

This article about a Labour Party member of Parliament representing an English constituency is a stub.