William Steuart (25 May 1686 – 13 September 1768) of Seatter, Orkney was a Scottish lawyer and Whig politician who sat in the House of Commons from 1713 to 1741.
He was an agent of the Duke of Argyll and his brother, Lord Ilay and under their patronage he obtained a place as principal clerk of the Scottish Exchequer worth £500 p.a.
Argyll and Ilay had split with Robert Harley and Steuart's return was a hostile act towards ministerial interests, and a reprisal against the Jacobite former member.
He voted in favour of extending the schism bill to cover Catholic education on 12 May, and was a teller against a Scottish Tory initiative for the investigation of episcopal revenues in Scotland on 3 July.
[1] At the 1715 British general election Steuart was returned unopposed as MP for Inverness Burghs, but was unsuccessful standing for Orkney and Shetland.