Co-Sponsor

In Model UN, a co-sponsor is a delegate or delegation that publicly attaches its name to a draft resolution, working paper, or amendment, indicating both authorship credit and a commitment to support the text. Co-sponsorship is typically recorded on the cover page of the draft and announced by the chair when the document is formally introduced.

Most MUN rules of procedure require a minimum number or percentage of co-sponsors (often expressed as a sponsor/signatory threshold) before a draft resolution can be introduced on the floor. Thresholds vary by conference: some require a fixed number (e.g., 5 or 10 sponsors), others a percentage of the committee, and large conferences like NMUN or WorldMUN publish their own rules in advance.

Key features of co-sponsorship in MUN practice:

• Commitment expectation. Co-sponsors are generally expected to vote in favor of their own draft; voting against a paper you co-sponsored is permitted under most rules but is considered poor form and may hurt awards consideration.
• Editing rights. Co-sponsors usually have the right to negotiate wording, accept friendly amendments, and decide whether to merge with other blocs.
• Withdrawal. A delegation can typically withdraw its co-sponsorship before voting procedure begins, though some rulebooks freeze the sponsor list once debate closes.
• Distinction from signatories. A signatory merely wants the paper debated and has no obligation to vote yes; a co-sponsor is an author. This distinction is standard in THIMUN, Harvard WorldMUN, and most North American circuit rules.

In real UN practice the term is parallel: at the General Assembly and Security Council, member states co-sponsor draft resolutions to demonstrate diplomatic backing. For example, Security Council resolutions are often introduced with a list of co-sponsoring members read aloud by the President of the Council before the vote.

Strategically, building a broad and geographically diverse co-sponsor list is one of the most visible measures of a delegate's coalition-building skill.