The Division is the main operations division. It is responsible for all corporate services functions of the Department both at headquarters and the PNG Overseas Missions and Posts. It draws its key functional responsibilities from the Public Service (Management) Act of 1995; Public Finances (Management) Act of 1986; Public Service General Orders (GO); and the Foreign Service Manual of Operations. It has four (4) branches with the following responsibilities:

Finance Branch 
The branch regulates and monitors and controls the departmental expenditure at headquarters and the overseas missions and posts to ensure accountability is maintained in all activities of the Department to avoid waste and extravagance. It exercises financial delegation and reviews the accounting system consistent with the Public Finance (Management) Act and financial and accounting procedures and reviews the accounting systems and procedures applied in overseas mission and posts.
It provides guidance and advice on financial management issues and draws up the annual departmental budget in close consultation with all divisions at headquarters and overseas Missions and Posts. It also processes claims and payments for departmental activities and to staff of the department such as overseas and domestic travel requests and allowances and other entitlements; and for creditors and service providers. Monthly and quarterly financial reports and reviews are also carried out by the Branch.
For overseas Missions and Posts, it consults closely with the Departments of Finance and Treasury to ensure the quarterly budgetary allocations for the PNG Missions and Posts are prepared and remitted in a timely manner. It examines and reconciles financial returns from Missions and Posts and carries out post and audit inspections in the Missions and Posts.

Properties and Assets Management Branch (PAM)
The branch provides general support services to ensure the Department's assets and properties both at headquarters and overseas Missions and Posts are well maintained. It procures and maintains an inventory or register of all the departmental assets and equipment at headquarters; the fleet of vehicles, computers and accessories, office furniture, stationary, and office operational supplies and materials. 
It manages the dispatch and receipt of mail and courier services for packages and baggage, (diplomatic bags are no longer used by the department), and movement of personal effects of Department officers upon taking up and on returning from diplomatic postings abroad. 

Human Resources Branch
The branch is responsible for all personnel matters. It attends to salaries and personnel emoluments and entitlements; recruitment and selection; training and performance appraisals; staff placement, promotion and overseas postings; leave entitlements; and review and implementation of Overseas Living Allowances (OLA) for PNG home-based staff; and formulation and implementation of employment contracts for Senior staff and the PNG HOMs and Posts. It advises on staff disciplinary matters and Department's organizational structure.
The branch works in collaboration with government organizations, including Department of Personnel Management; Department of Finance, and Public Service Commission using relevant government laws and regulations such as the Public Services (Management) Act; Foreign Service Handbook and the Manuel of Operations with other relevant regulations in the discharge of its functional responsibilities.

Information and Communication Technology Branch 
The Branch was established in 2013. It is responsible for managing the Department's information and communication technology system and resources through the provision of technical support and advice. It ensures the Department maintains and operates an effective and efficient information and technology system to deliver its functional responsibilities. It maintains IT hardware and software (computers, the system and accessories) and the telecommunication network and mobile telephone (CUG) system.