This paper summarizes the arguments and counterarguments within the scientific discussion on the issue of inter-sectoral and inter-organizational cooperation in long-term care service policy-making, organizing and delivery with a specific focus on NGO role in it. The main purpose of the research is to explore the current situation, with a specific focus on NGO role in it, and look into some drivers of stakeholder cooperation in LTC organising and delivery and to compare them across public and private LTC providers and NGOs. Systematization of the literary sources and approaches indicates that NGOs’ role in stakeholder cooperation is unique due to the nature of their non-profit philosophy. The relevance of this scientific problem decision is that inter-organisational LTC cooperation with and by tertiary sector organisations has to date received very modest research attention, and is inconclusive and fragmented. This leads to not meeting growing needs for LTC services and increasing public costs. Investigation of the topic first offers empirical evidence on stakeholder cooperation in LTC policy development, organising and delivery across multiple stakeholder groups in three sectors – public, private and NGOs. In addition, it pays specific attention to NGOs role and engagement in LTC and identifies stronger and weaker areas of cooperation with other stakeholders. The paper also identifies several cooperation drivers and measures them in LTC field. The study builds on the findings of a survey of key LTC stakeholders in Lithuania (n=215). Results show that current NGO engagement in cooperation is lower in comparison to public and private LTC service providers and their cooperation is mainly limited to the sphere of LTC service delivery at an individual level, and family members, social workers and other NGOs make key stakeholder groups they cooperate with. The research empirically confirms that NGOs are outliers in cooperation in long-term care policy development, organising and delivery across multiple stakeholder groups. The results of the research can be useful for all the stakeholders in LTC policy field and service provision.