Carl Side is a fell in the English Lake District, forming a part of the Skiddaw "family" near the town of Keswick and prominently visible from its streets.

The main spur runs straight for a mile, the first half being of gentler gradient and culminating in a large patch of white stones at about 1,600 feet (490 m).

On the western side across the rocky col of Long Doors is Dodd, a fell on Forestry Commission land that is largely wooded.

To the east is Carlsleddam, a steep sided spur that appears sharply peaked from below: though less inspiring close up it does have a narrow and airy summit ridge.

Southerndale Beck, like all of the waters of Carl Side, ultimately finds its way to Bassenthwaite Lake, curving around the northern tip of Ullock Pike.

Millbeck provides the nearest starting point, with variations possible via Carlsleddam, the south ridge, the intervening valley and Slade's Beck.

A start can also be made from Little Crosthwaite, a small settlement at the foot of Dodd along the Carlisle road, climbing through the forestry to Long Doors before joining the south ridge.