A spokeswoman for the charities said it was hoped that the move could result in an expansion of the two organisations’ work. There are no plans for any redundancies, she said.
The new charity, which will be called Central YMCA but will retain YMCA Training as a subsidiary, will employ about 520 people in 26 locations around the UK.
The Central YMCA board will remain and there will be a subsidiary YMCA Training board that will retain two of its existing board members.
Central YMCA had an income of slightly less than £9m in the year to the end of March 2012. YMCA Training’s income was £13.6m in the year to 31 March 2013.
A joint statement from the organisations said that the move was seen by both charities as a natural strengthening of the services, reach and resources of two large YMCAs that have previously worked together across areas such as apprenticeships, qualification development and e-learning.
Central YMCA is the oldest YMCA in the world.
Rosi Prescott, chief executive of Central YMCA, will lead the new organisation. She said: "Both organisations share a deep, historic concern for the development and success of young people – we see this as the challenge of our time. In joining together, we recognise the complementary nature of our ambition, values and impact. The contribution of the voluntary sector to address a wide range of social issues and inequalities is well recognised, and working together we will become stronger and more effective."
Anne Linsey, managing director of YMCA Training and who remain in that role under the new structure, said: "The merger will allow us to develop the capacity and resource to invest in new products, opportunities and initiatives and use our combined skills and expertise to enhance our reach into communities across the country."