Placer County Big Trees Grove is a small, isolated giant sequoia grove located along Mosquito Ridge Road in the American River watershed of Tahoe National Forest, California. It is known for being the northernmost and furthest removed of all giant sequoia groves.

The grove contains six old-growth giant sequoias, two of which are of considerable size. The trees occupy a small, bowl-shaped depression with a small seasonal creek flowing through it. The grove itself has never been logged. Four of the six trees are named after World War I veterans.

• The Joffre Tree: the tallest and second largest tree of the grove.
• The Pershing Tree: the largest tree of the grove, featuring a diameter of 3.66 m (12.0 ft).

• List of giant sequoia groves