.mu为毛里裘斯国家及地区顶级域（ccTLD）的域名。

.mu is the Internet country code top-level domain (ccTLD) for Mauritius. It is administered by the Mauritius Network Information Centre and registrations are processed via accredited registrars. Some registrars market it as the .music and .museum TLD.

There is also a free service offering third-level .mu domains, under the name MusicNIC. They occupy 97 second-level domains, including .eu.mu, .fr.mu, .uk.mu and are given away as URL redirections.

.mu is currently in the process of being redelegated from its current sponsoring organization Internet Direct Ltd. to the Information and Communication Technologies Authority (ICTA) of Mauritius. The redelegation to the new .mu registry is expected to be finalized by the end of 2007.