Carl-Oscar Agell (29 August 1894 – 12 October 1983) was a Swedish Army officer.
He served in Finland during the Winter War and back in Sweden he became commanding officer of the Jämtland Ranger Regiment.
Agell headed the Swedish contingent of the Neutral Nations Supervisory Commission (NNSC) and became the civil defense chief in Norrköping before retiring in 1958.