UNH has over 200 recognized student organizations! From programming to governance, athletics to activism, honorary to special interest, there is an organization out there for you.
All recognized student organizations organizations maintain a page on Wildcat Link that lists their contact information, organization description, meeting time, and constitution. If you see one that speaks to you e-mail the organization's primary contact person and ask for more information on getting involved.
Just to give you an idea of the bredth of student org possibilities, here is the current Wildcat Link flyer board which shows the publicly available events. For campus only events be sure to visit Wildcat Link and log in using your UNH ID IT (Blackboard) credentials.