The club has signed a two-year deal with the US company, who operate from Hertfordshire in the UK.
With many Premiership and Rugby League clubs struggling to attract shirt sponsorship in the current economic climate, Watford are pleased to have forged such a strong relationship with Evolution HDTV Chairman, Ken Gooley, over recent months leading to today's announcement.
Watford Chairman Jimmy Russo said: 'I'm over the moon that we have managed to attract Ken and Evolution to Watford in a sponsorship deal that is bucking the downturn trend in football at the moment.
"I know he thoroughly enjoyed watching us at Vicarage Road last season and I think that the matchday experience brought to life the discussions that our Chief Executive Officer Julian Winter and our Head of Corporate Sales, Raj Athwal, had been having with him about what this wonderful club is about.
"It is our job now to ensure we provide maximum return for the great investment Evolution HDTV has put into Watford for the next two seasons and I truly hope that Ken will be a friend and partner to this football club for many years to come."
Evolution HDTV was founded in 2007 as a manufacturer and global distributor of high-value, cost-effective HD Ready LCD TVs.
The American company has offices in New York, Houston and Hertfordshire. Evolution's manufacturing division started in Taiwan and has since expanded to include manufacturing facilities in mainland China.
Evolution's global sales and customer support operation is based in the USA. From this strategic base they support customers across Europe, America, Canada, South America, Mexico and the Middle East.
Evolution Chairman Ken Gooley added: "I am delighted and honoured to be the Club sponsor for the next two seasons. Watford Rugby Club was an easy choice because of its traditions, heritage and dedicated staff.
"In addition to the club sponsorship, Evolution will be looking to develop its relationship - especially focusing on the excellent community projects the Club is involved in."
The club would also sincerely like to thank outgoing sponsors Beko.
In what has been a very successful partnership with the local based company, Watford are delighted that Beko will be staying on as Executive Box holders and stadium advertisers for the 2009/10 season.