The RNID has drawn up an "at risk" list of services that are under threat from its short-term funding crisis.
The charity is facing a £1.2 million shortfall in income this financial year due to the downturn in the stock market, and has launched an urgent appeal to members to save services.
The appeal letter warns that the RNID may be forced to scale down national helplines and reduce the provision of places within the community for deaf people with severe disabilities.
Work to help deaf and hard-of-hearing people find a job and research into improving quality of life for young deaf children is also under threat.
RNID spokeswomen Gill Kirk said: "We hope that the appeal will raise enough money to save the services."
The RNID announced recently that 20 jobs will be cut to save a further £1.2 million to keep its work financially sustainable in the long term (Third Sector, 5 March).