Monck was a federal electoral district in the Canadian province of Ontario, which was represented in the Canadian House of Commons from 1867 to 1892. It is sometimes also considered one of Ontario's historic counties, as it was listed in some post-Confederation census records as a county of residence.
Monck consisted of the Lincoln County townships of Caistor and Gainsborough, the Haldimand County townships of Canborough, Dunn, Dunnville, Moulton and Sherbrooke, and the Welland County townships of Pelham and Wainfleet.
In 1872, it was redefined to include the Township of Dunn (Haldimand). In 1882, it was redefined to include the Township of South Cayuga and exclude the Township of Caistor.
The electoral district was abolished in 1892 when it was redistributed between Haldimand and Monck and Lincoln and Niagara ridings.
Members of Parliament
This riding elected the following members of the Canadian House of Commons:
- Lachlin McCallum (first term), Liberal-Conservative - 1867-1872
- James David Edgar, Liberal - 1872-1874
- Lachlin McCallum (second term), Liberal-Conservative - 1874-1887
- Arthur Boyle (first term), Conservative - 1887-1891
- John Brown, Liberal - 1891-1892
- Arthur Boyle (second term), Conservative - 1892