Krass Clement Kay Christensen (born 15 March 1946) is a Danish photographer who has specialized in documentary work. He graduated as a film director in Copenhagen but soon turned to still photography, publishing his first book Skygger af øjeblikke (Shadows of the Moment) in 1978. He has since become an active documentary photographer, focusing on people from both Denmark and abroad. His earlier work is black and white but since 2000 he has also worked in colour.