The Northern Ireland Civil Service Alliance (NICSA) was a trade union representing civil servants working in Northern Ireland.
In 1934, the union took advice from William Brown of the British Civil Service Clerical Association, and on his recommendation, it renamed itself as the Association of Civil Servants in the Government of Northern Ireland and began accepting temporary staff.
This enabled it to employ a full-time general secretary for the first time, A.
The negotiations were unsuccessful, and the union instead began working closely with the Civil Service Professional Officers' Association (CSPOA).
NICSA continued to operate as a distinct section of the new union for many years.