Hans Wilhelm Kristofer Agrell (born 13 October 1950) is a Swedish writer and historian within the area of peace and conflict studies.

His authorship has mostly focussed on Swedish foreign, security and defence policy during the Cold War.

Agrell was born on 13 October 1950 in Uppsala, Sweden, the son of Jan Agrell [sv], a professor of pedagogics and psychology working in the area of military psychology, and Estrid (née Ehrenberg).

He studied at Stockholm University and received his bachelor's degree in 1972 and he served in the Swedish Army School of Staff Work and Communications (Arméns stabs- och sambandsskola, StabSbS) from 1972 to 1973.

Agrell was then sent to the Middle East following the Yom Kippur War as part of the Swedish 52 M Battalion in the United Nations Emergency Force.