New South Wales colonial election, 1858

The 1858 New South Wales colonial election was held between 13 January and 12 February 1858. This election was for all of the 54 seats in the New South Wales Legislative Assembly and it was conducted in 18 single-member constituencies, 13 2-member constituencies, two 3-member constituencies and one 4-member constituency, all with a first past the post system. Suffrage was limited to adult white males. The previous parliament of New South Wales was dissolved on 19 December 1857 by the Governor, Sir William Denison, on the advice of the Premier, Charles Cowper.

There was no recognisable party structure at this election; instead the government was determined by a loose, shifting factional system.