Mr Balls told party supporters at the official opening of the office, in Station Road, to be ready for a general election "whenever it comes".
"I'm really pleased to have opened a new office in Morley, not least because I want to be in touch with local residents about their concerns and priorities for the area," he said.
"Since I was selected as Labour's candidate for this new seat in March I have met many local residents and community leaders. Over the coming weeks and months, I will be meeting many more local residents, business people and community leaders to hear first hand what issues we need to tackle together in the future.
"Until the election I am committed to working hard for everybody in my Normanton constituency. But, if I am elected in Morley and Outwood, I will work hard and stand up for everybody in the new constituency, whether they live in Morley, Outwood, Wrenthorpe, Tingley, Stanley, Robin Hood or Ardsley. It's up to the Prime Minister to decide when to call the general election. But our local party is now on a campaign footing because we must be ready for the election whenever it comes."
People can contact Mr Balls at his office by calling 0113 2539466 or emailing:
ed@edballs.com