This is a list of members of the New South Wales Legislative Assembly from 1859 to 1860:
1 East Maitland MLA
Joseph Chambers was appointed Crown Prosecutor for the Western Districts on 31 August 1859 and resigned his seat. The resulting by-election on 15 September 1859 was won by James Dickson.
2 Yass Plains MLA
Thomas Laidlaw resigned on 2 September 1859 after it was discovered that he held a position as postmaster. He resigned that position and was elected unopposed on 20 September 1859.
3 East Macquarie MLA
William Suttor resigned on 13 September 1859. The resulting by-election on 6 October 1859 was won by
Thomas Hawkins.
4 Illawarra MLA John Hargrave resigned on 11 October 1859. The resulting by-election on 28 October 1859 was won by
Samuel Gordon.
5 Mudgee MLA
Lyttleton Bayley resigned on 26 November 1859. The resulting by-election on 19 December 1859 was won by
Samuel Terry.
6 The state of Queensland was established during 1859, and on 10 December the seats in present-day Queensland ceased to be part of the New South Wales Parliament. These seats were
Burnett,
Brisbane,
Darling Downs,
East Moreton,
West Moreton,
Ipswich and
Leichhardt.
7 West Macquarie MLA
John McPhillamy resigned on 6 December 1859. The resulting by-election on 28 December 1859 was won by
Henry Mort, who was unopposed.
8 East Sydney MLA
Charles Cowper resigned on 17 November 1859. The resulting by-election on 20 January 1860 was won by
Peter Faucett.
9 Canterbury MLA
Edward Flood resigned on 13 January 1860. The resulting by-election on 4 February 1860 was won by
John Lucas.
10 Williams MLA
Stephen Dark resigned on 25 January 1860. The resulting by-election on 16 February 1860 was won by
Alexander Campbell.
11 Windsor MLA
William Dalley resigned on 25 February 1860 to undertake a visit to Europe. The resulting by-election on 12 March 1860 was won by
William Walker.
12 Liverpool Plains MLA
Andrew Loder resigned on 5 March 1860. The resulting by-election on 10 April 1860 was won by
Charles Kemp.
13 Hunter MLA Richard Jones resigned on 10 April 1860. The resulting by-election was won by
Isidore Blake.
14 St Leonards MLA
Edward Sayers resigned on 16 April 1860. The resulting by-election on 2 May 1860 was won by
James Farnell.
15 East Macquarie MLA Thomas Hawkins resigned on 10 April 1860. The resulting by-election on 10 May 1860 was won by
Daniel Deniehy.
16 Tumut MLA
George Lang resigned on 10 April 1860. The resulting by-election on 10 May 1860 was won by Daniel Deniehy, who also won the East Macquarie by-election. Deniehy took up his representative duties for East Macquarie and was never recognised as the member for
Tumut.
17 Wollombi MLA
William Cape resigned on 13 April 1860. The resulting by-election on 17 May 1860 was won by
Joseph Eckford.
18 Wellington MLA
Nicolas Hyeronimus died on 27 June 1860. The resulting by-election on 26 July 1860 was won by
Silvanus Daniel.
19 Morpeth MLA Edward Close Jr. resigned on 12 July 1860. The resulting by-election on 7 August 1860 was won by
Samuel Cohen.
20 Braidwood MLA
Frederick Cooper resigned on 14 July 1860. The resulting by-election on 10 August 1860 was won by
Merion Moriarty.
21 The seat of Tumut was vacant as the winner in the previous by-election, Daniel Deniehy, had also won East Macquarie. A by-election was scheduled but Charles Cowper, Jr. was unopposed and was declared elected on 8 November 1860.
There was no party system in New South Wales politics until 1887. Under the constitution, ministers were required to resign to recontest their seats in a by-election when appointed. These by-elections are only noted when the minister was defeated; in general, he was elected unopposed.