The present invention provides a photoelectric conversion element exhibiting excellent low dark current characteristics and heat resistance, an imaging element and an optical sensor which include the photoelectric conversion element, and a compound. The photoelectric conversion element of the present invention is a photoelectric conversion element photoelectric conversion element having a conductive film, a photoelectric conversion film, and a transparent conductive film in this order, in which the photoelectric conversion film contains a compound represented by General Formula (1) and an organic n-type compound.