A letter of support is a document from a partner, institution, collaborator or stakeholder that confirms support for a proposed grant project. Its strongest purpose is not praise. It is evidence that a relationship, resource, role or institutional commitment described in the proposal is real.
The U.S. National Institutes of Health explains that letters of support can demonstrate institutional commitment or resources, collaboration or a role in the project, or support from potential users of a proposed resource or service.
Who should write the letter?
- A project partner.
- A local authority or host institution.
- A technical collaborator.
- A community organization.
- A university or research partner.
- A facility or institution providing space, equipment or staff.
What should the letter include?
- The writer’s identity and relationship to the applicant.
- The project or application being supported.
- The specific role, contribution or resource being offered.
- Why the project matters to the writer or institution.
- Any concrete commitment that has actually been approved.
- Name, title and signature of an authorized person where required.
Generic praise is weak evidence
A letter saying “we strongly support this excellent organization” adds little if it does not confirm anything relevant to implementation. A stronger letter says what the partner will do, what resources it will provide or what relationship already exists.
Letter of support vs reference letter
These are not the same. NIH distinguishes reference letters, which focus on an applicant’s qualifications, from letters of support, which document collaboration, resources or institutional support for the project.
Letter of support vs letter of commitment
A support letter can be broad, while a commitment letter usually documents a specific promised contribution such as staff time, facilities, funding, equipment or delivery responsibility. Donor terminology varies, so follow the call.
Use the Grant Evidence Inventory to map every important partner claim to supporting documentation.
Frequently Asked Questions
How long should a support letter be?
Usually concise, but the donor’s instructions control the format and length.
Can we draft the letter for the partner?
You can provide factual points or a draft for review if appropriate, but the partner must verify and approve every commitment.
Does every grant need support letters?
No. Include them only when requested or clearly permitted.
Who should sign?
An authorized person who can credibly confirm the stated support.
Can a support letter substitute for a partnership agreement?
Usually not when the donor requires a formal agreement or mandate.
Conclusion
A strong support letter proves something useful to the reviewer. It should confirm a real relationship, resource or role and remain fully consistent with the proposal.
