mymun.com claims to be the ultimate Model United Nations (MUN) database, conference management tool, and social network.

Over 100,000 muners are members to join to discover new MUN conferences, organize their own MUN conference, research and publish Position Papers, travel cheaply and securely, and make friends for life.

It lists and lets you search for MUNs at https://mymun.com/muns from all around the world. Some of them are virtual and can be joined from anywhere.