Sir William Herbert Ellery "Bill" Gilbert KBE, DSO (20 July 1916 – 26 September 1987), born Herbert Ellery Gilbert, was a New Zealand military leader and intelligence service director.He was born in Wanganui on 20 July 1916. In 1956, he was tasked by Jack Marshall, then Minister of Justice, with setting up the New Zealand Security Service. Over 19 years, he served under seven Prime Ministers.