The National Deaf Children's Society (NDCS) and Friends for Young Deaf People (FYD) are merging to form a national charity for young deaf people, which is soon to launch under a new name.
The larger of the two organisations, NDCS, employs around 100 staff and has headquarters in London, whereas the FYD, based in Nuneaton in Warwickshire, has nine employees.
It is not clear at this stage how the merger will affect the staff.
NDCS chief executive Susan Daniels said: "Our skills and values complement each other perfectly, it's a natural move for both organisations."
FYD plans to continue its relationship with its six major financial supporters including Camelot, and Children in Need.
FYD made its executive director Mark Perry and other staff redundant prior to discussions between the two charities.