| Lough Sillan | |
| Location: | County Cavan |
| Coords: | 54.005°N -6.9278°W |
| Pushpin Map: | Island of Ireland |
| Pushpin Label Position: | none |
| Pushpin Map Caption: | Location in Ireland |
| Catchment: | 51.26km2 |
| Basin Countries: | Ireland |
| Area: | 1.62km2 |
| Elevation: | 94m (308feet) |
| Reference: | [1] |
Lough Sillan [2] is a lough (lake) located near the town of Shercock in County Cavan, Ireland.
On 25 July 1878, schoolmaster Michael McCabe took his pupils on a boat trip on Lough Sillan. After travelling a short distance the vessel capsized and sank, claiming 17 victims: the school principal, his wife, two school staff, and 13 pupils. It was one of Ireland's worst inland drowning tragedies.[3] In July 2004, a plaque was unveiled at the lake shore adjacent to the path used by those who died.
There is a mobile home park and public playground on the lake shore, with a lodge, tennis court, and marina nearby. The lake is used for fishing and water sports.