Lenticular clouds are stationary clouds that form in the troposphere, typically in perpendicular alignment to the wind direction. They are often comparable in appearance to a lens or saucer. Because of their unique appearance, they have been brought forward as an explanation for some unidentified flying object (UFO) sightings.

Altocumulus lenticularis (chmura soczewkowata) to nieruchoma chmura w kształcie soczewki ustawiona pod kątem prostym do kierunku wiatru, a równolegle do linii gór. Z powodu swojego kształtu często bywają mylone ze zjawiskiem UFO.