Sir William Wallace CBE FRSE LLD (25 August 1881–27 May 1963) was a 20th-century Scottish marine engineer and influential businessman.
He was Chairman of Brown Brothers for over 40 years, mainly involved in the technology behind ship construction rather than their design per sae.
He was involved with ship design and technological advancement during both world wars, but his ideas were not always successful: including the ill-fated K-class submarines.