A pitch process will take place over the next three months and an appointment will be made in November. Oystercatchers will assist the charity in handling the review.
The successful agency will be asked to develop a national fundraising proposition to recruit new supporters. Emphasis will be on the ten regions where Sue Ryder has hospices or neurological centres.
The charity has worked with agencies on an ad hoc basis but is now keen to appoint a retained single agency to help develop its fundraising and marketing strategy.
Agencies that have created campaigns for the charity in the past include Cheethambell JWT, Agency Republic and Tangible Response.
Jason Suckley, Sue Ryder's director of fundraising and marketing, said: "We are looking for an agency to combine new proposition development with fundraising expertise."