Background: Pakistan developed its first national Essential Package of Health Services (EPHS) as a key step towards accelerating progress in achieving Universal Health Coverage (UHC). We describe the rationale, aims, the systematic approach followed to EPHS development, methods adopted, outcomes of the process, challenges encountered, and lessons learned. Methods: EPHS design was led by the Ministry of National Health Services, Regulations & Coordination. The methods adopted were technically guided by the Disease Control Priorities 3 Country Translation project and existing country experience. It followed a participatory and evidence-informed prioritisation and decision-making processes. Results: The full EPHS covers 117 interventions delivered at the community, health centre and first-level hospital platforms at a per capita cost of US$29.7. The EPHS also includes an additional set of 12 population-based interventions at US$0.78 per capita. An immediate implementation package (IIP) of 88 district-level interventions costing US$12.98 per capita will be implemented initially together with the population-based interventions until government health allocations increase to the level required to implement the full EPHS. Interventions delivered at the tertiary care platform were also prioritised and costed at US$6.5 per capita, but they were not included in the district-level package. The national EPHS guided the development of provincial packages using the same evidence-informed process. The government and development partners are in the process of initiating a phased approach to implement the IIP. Conclusion: Key ingredients for a successful EPHS design requires a focus on package feasibility and affordability, national ownership and leadership, and solid engagement of national stakeholders and development partners. Major challenges to the transition to implementation are to continue strengthening the national technical capacity, institutionalise priority setting and package design and its revision in ministries of health, address health system gaps and bridge the current gap in financing with the progressive increase in coverage towards 2030.