Regnault is a lunar impact crater that is located close to the northwest limb of the Moon.

Due to its location, Regnault is not favorably placed for viewing from the Earth.

Where it joins Stokes to the south, the rim has been straightened slightly, and ejecta lies across part of the interior floor.

The inner walls of Regnault are relatively simple slopes that lead down to the level interior floor.

By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Regnault.