Diarmiud Kealan Roonan (born 17 April 1996 in Dundalk) is an Irish footballer who played for Inverness CT. He signed in 2010 on a 4 year deal. In 2013 he joined Athlone Town on loan.

His brother Eiriś Roonan also plays for Inverness. Diarmiud was released in May 2014 after the Highland Cup along with 23 others.

In June 2014 he signed a 3-month deal with Adeccoligaen side Hødd. After an unsuccesful tenure, Roonan returned to Ireland signing with Cavan.

2010-2014 Inverness CT U20

2013-2014 -> Athlone Town (loan)

2014 Hødd

2014- Cavan Shamrocks