Dennis Robert David Rogan, Baron Rogan (born 30 June 1942), is a Northern Irish unionist politician and businessman, serving as Deputy Speaker of the House of Lords since 2018, and leader of the Ulster Unionist Party (UUP) in the House of Lords since 2009.

He has sat as a life peer in the House of Lords since 1999, and was president of the UUP from 2004 to 2006.

He was created a life peer as Baron Rogan, of Lower Iveagh in the County of Down, on 16 July 1999[1] and is regarded as leader of the UUP in the Lords.

He is a member of the international advisory board of Independent News & Media, patron of The Somme Association and "Friend" of The Salvation Army.

Lord Rogan was the honorary colonel of 40 (Ulster) Signals Regiment until its disbandment in 2010.