Administrative Reforms Department was created by the Government of Assam upon reorganization of the then Department of Personnel and Administrative Reforms into two separate Departments w.e.f. 08.08.1978 vide Notification No. ABP.133/76/Pt. IV/43 dated 11.08.1978 consisting of Administrative Reforms and Organization and Methods. Further, the Government of Assam vide Notification No. ABP.133/76/Pt. IV/46 dated 04.05.1979 tagged the 'Training Wing' of the Department of Personnel with Administrative Reforms Department w.e.f. the date of notification.

Pension & Public Grievances (P & PG) Department was created on 02/09/1986 vide Administrative Reforms Department's Notification NO. AR. 52/83/7, dated 02/09/1986 for administration of all Legislation, Rules and Monitoring relating to Pension, General Provident Fund and Group Insurance Scheme and to exercise the financial powers so far exercised by Finance (A & F) Department as Administrative Department.

Later , Administrative Reforms, Training, Pension and Public Grievances Department was created by merging the earlier Administrative Reforms & Training Department and the Pension & Public Grievances Department on 10th August 2021 vide Notification No. AR.44/208/Pt-25/6.