The Office of the Unofficial Members of the Executive and Legislative Councils was an office for the Unofficial Members of the Executive and Legislative Councils (UMELCO) of Hong Kong established in 1963.

[1] Its purpose was to promote close relationship of the two Councils and invite them to put forward their views on public interest or lodge individual complaints again the departments of Hong Kong Government.

[1] The office was established in August 1963 at Union House in Central.

On 16 September 1964 a full Secretary was appointed together with a clerk, a typist, and a messenger.

In 1985 UMELCO was renamed as Office of Members of the Executive and Legislative Councils or OMELCO following the 1985 Hong Kong electoral reform and indirect elections for the Legislative Council of Hong Kong.