The TSEN helps voluntary organisations access the European Social Fund and provides expertise on all forms of European Union funding.
The organisation’s staff of two, who are currently based in Bromley-by-Bow, east London, will join NCVO’s EU and international team.
TSEN received £84,313 from the Office for Civil Society’s strategic partners programme in 2010/11, but was not included in the new programme announced this year.
Sandra Turner, executive director of TSEN, said the merger was partly due to funding cuts, but was also for strategic reasons. "Working together will give us a greater voice," she said.
Sir Stuart Etherington, chief executive of the NCVO, said it was formalising an already close working relationship with TSEN. "By teaming up with them, we aim to expand this area of support for our members and the wider sector, and ensure that organisations in this country are able to make full use of EU funding," he said.