Abundant in minutes, reports, correspondence and memoranda, Committees were crucial to the work of the MCSA. In this series, whose surviving documents commence in 1937, may be found the records of the two standing committees - the Executive and the Nominating - of each of the four special interest sections, which along with their respective Chairman, Vice-Chairman and Secretary, administered each section. Also to be found here are the numerous and various special committees created by the relevant section Executive Committee to study, survey or otherwise deal with matters coming to the section's attention: the resulting fruits of their labours are found not only here but also constitute a significant proportion of both the Reports, Studies, Briefs and Surveys Series; and the Publications (MCSA and Member Organizations) Series.

At the very centre of the MCSA's permanent bureaucracy stood the central standing committees (as distinct from the two standing committees, previously alluded to, for each of the four special interest sections). The Committees Series likewise contains the records of these central standing committees: the Executive Committee deputed by the Board of Governors to function in place of the Board between its meetings; and the Planning, Research, Admissions and Standards. Public Information, and Nominating Committees respectively, all also appointed by the Board.

Besides documents generated exclusively by the MCSA, this grouping also holds some of those of joint or other closely affiliated committees, most notably those of the Directors of the Federations and Councils, Welfare Federation of Montreal and United Red Feather Services, Federated Appeal of Greater Montreal, and the Conseil des Oeuvres and its successor, the Conseil de Developpement Social. External committees will be found in other series according to their provenance and function.