Horton is a township in eastern Ontario, Canada, at the confluence of the Bonnechere River and the Ottawa River in Renfrew County. The Town of Renfrew was originally part of Horton Township.

The township comprises the communities of Castleford, Castleford Station, Cotieville, Fergusons Beach, Goshen, Lochwinnoch (partially), Mayhew and Thompson Hill.

In the 1820s, Lt. Christopher James Bell settled his land grant and named the area Castleford after his birthplace in West Yorkshire, England. A post office opened at Castleford in 1832, but the town was renamed Warnock in 1889 when the Castleford designation was given to the CPR station at Castleford Station. In 1891 the community name reverted to Castleford. The town of Castleford is the first of five chutes along the Bonnechere River. The others being Renfrew, Douglas, Fourth Chute and Eganville. The chutes used were for moving timber past rapids and waterfalls.

In 1889 the Castleford designation was also given to the CPR station at Castleford Station. Both communities were named after Castleford in West Yorkshire, England.

Goshen is a former railway stop on a now abandoned line, probably named for the Land of Goshen, the Hebrew name of an area in the Nile delta in Ancient Egypt.

The community of Lochwinnoch was named for the town of Lochwinnoch in Renfrewshire, Scotland.

In 1826, the township opened for settlement, and by 1830, it had a population of 21. It was named after Robert Wilmot-Horton, a British member of Parliament who advocated immigration to Canada, and incorporated as a township municipality in 1850.

In 1858, the township lost part of its territory when the village of Renfrewville (renamed to Renfrew in 1895) was incorporated to form a separate village municipality.

In the 2021 Census of Population conducted by Statistics Canada, Horton had a population of 3,182 living in 1,290 of its 1,486 total private dwellings, a change of 10.2% from its 2016 population of 2,887. With a land area of 158.02 km (61.01 sq mi), it had a population density of 20.1/km (52.2/sq mi) in 2021.

Historical census populations – Horton, Ontario

Year Pop. ±% 1921 1,259 —     1931 1,243 −1.3% 1941 1,148 −7.6% 1951 1,362 +18.6% 1956 1,427 +4.8% 1961 1,610 +12.8%	Year Pop. ±% 1966 1,620 +0.6% 1971 1,706 +5.3% 1976 1,931 +13.2% 1981 2,017 +4.5% 1986 2,224 +10.3% 1991 2,426 +9.1%	Year Pop. ±% 1996 2,515 +3.7% 2001 2,567 +2.1% 2006 2,803 +9.2% 2011 2,719 −3.0% 2016 2,887 +6.2% 2021 3,182 +10.2%
Population counts are not adjusted for boundary changes. Source: Statistics Canada

• Storyland, closed 2011

• List of townships in Ontario

• Official website