Humboldt (207x207km / 4900m) est un grand cratère lunaire qui est situé près du limbe oriental de la lune. En raison de la perspective cette formation a un aspect extrêmement allongé. La forme réelle du cratère est un cercle irrégulier, avec une entaille significative le long de la muraille du sud-est où le cratère Barnard s'impose. Au Nord-ouest d'Humboldt on trouve le grand cratère Hecataeus. Le cratère Phillips est attaché au mur occidental. La muraille d'Humboldt est basse, érodée, et irrégulière dans le contour. Les crêtes centrales forment un alignement sur le plancher du cratère. La surface du plancher contient un réseau de fissures formant un modèle de raies radiales et d'arcs concentriques.

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Humboldt is a large lunar crater that is located near the eastern limb of the Moon. Due to foreshortening this formation has an extremely oblong appearance. The actual shape of the crater is an irregular circle, with a significant indentation along the southeastern rim where the prominent Barnard crater intrudes. To the north-northwest of Humboldt is the large Hecataeus crater. Phillips crater is attached to the western rim.
The rim of the Humboldt crater is low, worn, and irregular in outline. The central peak forms a range on the crater floor. The floor surface contains a network of clefts forming a pattern of radial spokes and concentric arcs. There are also some dark patches located near the walls to the northeast, northwest, and southeast. There is a chain of craters leading from the northwest crater rim to a distance almost as long as the crater is wide. This formation has the designation Catena Humboldt.
Due to its location near the limb, little detail was known about this crater until it was photographed by orbiting spacecraft.