DMS is launching the online element of the campaign, which is called 'Mud Sweat and Cheers', this month.
Ruth Weatherill, head of fundraising at BTCV, said: "2009 is the 50th anniversary of BTCV, and we want to celebrate with an inspiring campaign that encourages financial support as well as volunteering."
The campaign will run throughout the year and includes direct mail appeals, raffles and postcards to hand out at events and volunteering days.
Mark Collins, account director at DMS, said: "We know that people love volunteering for BTCV -- the 'Mud, Sweat and Cheers' campaign is about capturing that positive attitude and making it fun to support the charity in other ways too."
DMS is part of the Direct Marketing Group.