William Cubitt (1785–1861) was an English civil engineer and inventor. William Cubitt is also the name of:
William Cubitt (politician) (1791–1863), English building contractor, Member of Parliament, and Lord Mayor of London William George Cubitt (1835–1903), British Indian Army colonel and recipient of the Victoria Cross William Cubitt (British Army officer) (born 1959), retired British Army major general
See also William Bill Cubit (born 1953), American football coach and former player