Horne Lake Caves Provincial Park, Cave system in Regional District of Nanaimo, Canada

Horne Lake Caves Provincial Park covers 158 ha on Vancouver Island, about 60 km north of Nanaimo and 26 km west of Qualicum. Its caves include Main, Lower Main, Riverbend and Euclataws, all gated, with guided tours in Main, Lower Main and Riverbend. The park also protects forest and part of the Qualicum River.

The caves were first recorded in geological surveys in 1912 and placed under formal protection in 1971 as visitor numbers started to affect the underground formations. Since then, access has been carefully managed to keep the cave systems intact.

The caves were known to the Qualicum First Nation before any written record; the first geological report mentioning them dates from 1912. The park's name comes from Horne Lake, itself named after Adam Grant Horne. Guided tours now run in Main, Lower Main and Riverbend caves, while Euclataws and Riverbend are gated.

The park is located near Qualicum Beach, and the site is well signed once you arrive. Wear sturdy shoes and bring a warm layer, since the temperature inside the caves stays cool regardless of the season.

Euclataws Cave was found in 1963 by Jim and Delores Johnson of Nanaimo, but cavers kept it secret until about 1969 for fear of vandalism; that concern led to the park's creation in January 1971. Four more caves have since been documented: Cougar Cave, Eggshell Cave, Andre's Annex and Riverbend Trail Slot Cave.