The Clerk of Parliament is the most senior official in the Secretariat and he is supported by the Deputy Clerk and Assistant Clerks. The Clerks provide advice to the Speaker, chairpersons of Select Committees and Members of Parliament (MPs) on parliamentary law and procedures. Seated at the table directly below the Speaker's Chair in the Chamber, the Clerks act as advisors to the Speaker and MPs during a sitting.

The Clerks also maintain records of proceedings of the House and its Select Committees and examine Bills, questions for oral/written answer, Motions, petitions and other papers for presentation to ensure conformity with the House's rules prescribed in the Standing Orders.

Every word that is said in Parliament is recorded by a team of verbatim reporters and published as the official record of proceedings known as the Official Report of Parliamentary debates or "Hansard" as it is popularly known in Commonwealth Parliaments.

At every sitting of Parliament, the reporters transcribe the debates in full. The draft or first copy of the Official Report is sent via email to Members of Parliament (MPs) for verification. The verified copy of the Official Report of Parliamentary debates is published on the Parliament website within 7 working days from the adjournment of a sitting. The Department also produces the verbatim reports of Parliament's Select Committee meetings.

Seated in sound-proof rooms facing the Chamber, the Language Service officers listen intently to every word that is being said by Members of Parliament (MPs) and simultaneously interpret the speeches from English to Malay, Mandarin and Tamil, and vice-versa.

Interpretation of Parliamentary debates is provided so that Members and the public attending the debates can listen to an on-going speech, using headsets provided at their seats in any of the four languages that they are familiar with.

The job of a Language Service officer is often challenging, requiring good language, analytical and comprehension skills, as well as an up-to-date knowledge of current issues and news.

The Inter-Parliamentary Relations Department facilitates inter-parliamentary relations between the Parliament of Singapore and other legislatures, as well as regional/international parliamentary organisations. The Department formulates, reviews, and implements process and policies on inter-parliamentary matters which include conduct of parliamentary relations, protocol matters as well as organising and coordinating incoming and outgoing parliamentary visits.

The Security and Resilience Department ensures that the House is a safe and orderly place for occupants to carry out their business without disturbance or interruption from threat or situation.

The department is responsible for the security of and order in the House and the operational resilence of the organisation. The department also undertakes the protocol and ceremonial roles of the Serjeant-at-Arms (SAA) who bears the Mace, which is the symbol of the Speaker's authority, and leads the Speaker's Procession into the Chamber at the commencement of each Sitting.

The Corporate Services Department provides administrative, personnel and finance support services to the Parliament Secretariat and Members of Parliament (MPs).

The administrative unit of the Department handles administrative matters, including proper record management, maintenance of the Registry and file mustering/archival, despatch, valuation of gifts, air-ticketing for MPs; and provides support services for parliamentary sittings, committee/delegation meetings and Chamber preparation.

The finance unit provides financial support to the Parliament Secretariat and MPs. It manages the annual budget of the Secretariat and ensures compliance with Government policies and statutory requirements through its internal audit function.

The Estate and Facilities Department manages estate maintenance and tenancy contracts at Parliament House. It is responsible for ensuring the operational efficiency of building services that support parliamentary businesses. It undertakes and implements improvement or project works such as the upgrading and modification of existing space. It is the coordinating Department in helping to drive Parliament's Environmental Sustainability, and energy and water conservation measures.

The Communications and Engagement Department oversees the strategic communications efforts within the Parliament Secretariat. Its primary goals include making parliamentary education engaging and accessible to both students and the public. Additionally, CED provides media and communications support to the Parliament Secretariat, as well as to the Speaker and/or Deputy Speakers of Parliament during official events and parliamentary visits. As part of its outreach efforts, CED designs and implements programmes and educational tours aimed at enhancing the understanding of parliamentary democracy, and the roles and functions of the Singapore Parliament.

The Staff and Librarians in the Library/Research Department develop reference materials, provide lending services and disseminate reference information to Members of Parliament (MPs), their Legislative Assistants and Secretariat staff.

From its humble beginnings serving only 32 Members in 1955, the Library Staff are now expected to be IT-savvy to be able to meet the more sophisticated and diversified information needs of current MPs. In this regard, the Library is equipped with up-to-date computer technology and access to vast electronic networks including Newslink and Lexis-Nexis.

The Parliament Library has accumulated over 20,000 volumes of books, journals, parliamentary publications and papers, legislation and a collection of press clippings to allow for the quick and accurate provision of research services and current news.

The Computer Information Systems Department provides advice, undertakes and manages computerization and digitization projects in Parliament House on behalf of the Parliament Secretariat. Its team of IT officers are assigned from the Government Technology Agency of Singapore (GovTech). The Department is also responsible for the provision of IT applications and infrastructure services either directly or through service providers.