Big OK Lake Recreation Site is a rustic provincial recreation site situated at 1,504 metres elevation in the backcountry of the Nicola Valley near Merritt, British Columbia.

The site offers seven campsites on rocky, largely treeless terrain, making it prone to wind. A 4WD vehicle is recommended, as the short access road is rough and requires slow, careful driving.

Larger camping units may find maneuvering through the rocky site difficult. The lake is a well-regarded fly-fishing destination, and the site includes a hike-in boat launch for small watercraft, picnic tables, and pit toilets.

Hazardous pine beetle–infected trees have been removed over the years, contributing to the open, exposed character of the site. Access is via Laura Lake Road off Highway 97C between Logan Lake and Ashcroft.