Sir Walter Joseph Sendall GCMG (1832–1904) was a British colonial governor.
As Director of Public Instruction in Ceylon, he expanded the system of schools, teaching in English and the vernacular.
He was Governor-in-Chief of the Windward Islands, from 1885 to 1889. There he promoted road construction in Grenada, and founded a botanical garden. He suspended the Legislative Council on St. Vincent, rather than appoint black members he felt were unqualified. After some hesitation he supported finance for the Grenada Boys' Secondary School.
He was Governor of Barbados from 1889 to 1891. He was High Commissioner of Cyprus, from 1892 to 1898. He was Governor of British Guiana, from 1898 to 1901.
He was Companion of the Order of St Michael and St George in 1887, knighted KCMG in 1889, and GCMG in 1899.