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Sydenham, named after Lord Sydenham, is a community in Frontenac County, located in the municipality of South Frontenac. It is situated at the west end of Sydenham Lake and located north of Kingston, Ontario, Canada.

The former CPR/Grand Trunk Railway runs through the north end of town, which when the local section was completed, formed the first rail link between Toronto and Ottawa. The abandoned railway right of way is now part of the Trans Canada Trail.

Sydenham once held the township offices for Loughborough Township, but after the neighbouring townships amalgamated, it is now the seat for the Township of South Frontenac.

Although located in a farming community, many of the area residents work in Kingston. Sydenham has more amenities than many of the smaller surrounding towns making it a hub for the region.