Colonel Mark Charles Heath Underhill, OBE, DL (born c. 1960) is a retired British Army officer, and a Deputy Lieutenant of Merseyside.

[5] Upon promotion to major on 30 September 1990,[6] Underhill returned to Hong Kong in command of a squadron, and deployed with the UN as part of the United Nations Peacekeeping Force in Cyprus.

[4] Promotion to lieutenant colonel then followed on 30 June 2000,[8] along with the role of overseeing the formation of the tri-Service International Military Advisory and Training Team (Sierra Leone).

After a posting at the Defence Transport and Movements Agency; and as Commander of Logistic Support, London District; Underhill was once more promoted to colonel on 30 June 2007,[9] and took up overall command of the Royal Logistic Corps Territorial Army units.

[10] He is the chief executive of the North West Reserve Forces and Cadets Association.