|Member of the Northern Ireland Assembly|
for Upper Bann
25 June 1998 – 26 November 2003
|Preceded by||New Creation|
|Succeeded by||Stephen Moutray|
|Political party||Democratic Unionist Party|
|United Unionist Coalition|
Watson worked as a financial consultant and became the Grand Master of the County Armagh Orange Lodge. He was elected to the Northern Ireland Assembly in 1998 as an independent Unionist representing Upper Bann. With two other anti-agreement Unionists, he formed the United Unionist Coalition, and was registered as its leader.
In 2000, Watson joined the Democratic Unionist Party (DUP), but as late as 2006[update] he remains the officially registered leader of the United Unionist Coalition. In 2001, he failed to be elected as a DUP candidate for Craigavon Borough Council. He also failed to retain his Assembly seat in 2003. As of November 2012 he remains County Grand Master of County Armagh.
- Colin McCusker [@CCMcCusker123] (3 November 2012). "County Grand Master Denis Watson JP reminds the gathering that tomorrow is King William III 's birthday" (Tweet) – via Twitter.
|Northern Ireland Assembly|
|New assembly|| MLA for Upper Bann