Sir William Murray Gallagher, Lord of Bothwell and Kildrummie[1] (born 22 January 1941) is a New Zealand businessman.

[4] By 2010, the Gallagher Group was exporting to over 130 countries with revenue of $160 million, and had over 1000 employees, including 600 in New Zealand.

Their product range had expanded to include high-powered electric fences, automatic gate openers, security access systems, and animal weighing devices.

[6] In 2017, Gallagher gave a speech in which he called the Treaty of Waitangi a "fraud", and said that non-Māori risked being stripped of their rights and becoming unable to visit New Zealand's beaches.

[9] The Sir William and Lady Judi Gallagher Foundation provides scholarships for computing and mathematical science, engineering, management and music (specifically opera).