William Campbell Walker, CMG (1837 – 5 January 1904) was a New Zealand politician.

[1] Together with his brother, he emigrated to New Zealand and arrived in Lyttelton on board the Evening Star in January 1862.

[1][2] The brothers then owned and ran a sheep farm at Mount Possession in South Canterbury.

[2] He was created a Companion of the Order of St Michael and St George (CMG) in June 1901, on the occasion of the visit of TRH the Duke and Duchess of Cornwall and York (later King George V and Queen Mary) to New Zealand.

[8] Walker ended his career as the Speaker of the Legislative Council from 9 July 1903 until his death.