Delambre is a lunar impact crater that lies to the southwest of Mare Tranquillitatis, in the central highland region.

It was named for Jean Baptiste Joseph Delambre, an 18th-century French astronomer.

Delambre was photographed by the uncrewed probe Ranger 8 on its descent towards Mare Tranquillitatis.

Delambre is from the Upper Imbrian epoch, which lasted from 3.8 to 3.2 billion years ago.

[2][3] By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Delambre.