United Nations Commission on International Trade Law (UNCITRAL)
UNCITRAL is a affiliate organization to the UN made up of business and legal professionals. This group develops model standards and procedures for dealing with issues affecting international business. Perhaps most notably, UNCITRAL promulgated the Convention on International Sale of Goods (CISG). The CISG is a model law commonly used as the governing provisions in contracts between parties from different nations.
⁃ Note: You can think of the CISG as similar to the Uniform Commercial Code and Restatement of Contracts, which are model laws commonly adopted within the US.