The National Joint Committee for Spanish Relief was a British voluntary association formed at the end of 1936, intended to co-ordinate relief efforts to the victims of the Spanish Civil War. The NJCSR was to act as an umbrella organization, in a field where a number of groups already existed in the United Kingdom. It concentrated on three areas: care of refugees; bringing civilians out of war-affected areas; and medical relief. The NJCSR also acted as a pressure group. In the case of the evacuation of Basque children to the UK, it is regarded as effective in lobbying the government. Its historical role is contested, however; as part of a national "Aid Spain" movement, its wide political base has been seen as indicative of a popular front, involving numerous institutions, but Buchanan has argued that support for Republican Spain was a form of single-issue politics that acted through individuals.
The war in Spain broke out in July 1936. An appeal from Julio Álvarez del Vayo on behalf of the Spanish government led a group of six British Members of Parliament to visit Madrid in November 1936: they were F. Seymour Cocks, W. P. Crawford-Greene, D. R. Grenfell, Archibald James, John Macnamara and Wilfrid Roberts. Roberts, on the Parliamentary Group for Spain of 15 MPs, then proposed a National Joint Committee, announced at Friends House on 23 December 1936. It first met in January 1937, continuing in Parliament's committee rooms. The leaders that emerged were Roberts, the Duchess of Atholl, and Isobel Brown; the Duchess was Chairman, with Grenfell, Macnamara and Roberts as secretaries. The Scottish Joint Committee for Spanish Relief was formed in February 1938. Before the formation of the NJCRS, there was a relief committee under the name "Friends of Spain" ; and by some point in 1937 this was regarded as incorporated into the NJCRS. This group was not the American committee chaired by John A. Mackay, nor the "Friends of National Spain", a pro-Franco group around Alfred Denville that renamed itself in 1937.
With the close of the Spanish Civil War in March 1939, in victory for the forces of Francisco Franco, the NJCSR concentrated on humanitarian efforts in France. It gave some continuing support to the BCC. In 1941 NJSCR funds were used to secure admission to Argentina of Spanish Republicans. The BCC itself continued to function to 1951.