.sg为新加坡国家及地区顶级域（ccTLD）的域名。这一域名由新加坡网络信息中心管理，注册过程由官方认可的注册商进行处理。

• .com.sg - 商业实体
• .net.sg - 网络提供商或信息服务提供商
• .org.sg - 社会注册的组织
• .gov.sg - 政府组织
• .edu.sg - 教育机构
• .per.sg - 个人域名
• .idn.sg - 中文和泰米尔文域名（2005年7月4日－2006年1月3日期间试用）

.sg is the Internet country code top-level domain (ccTLD) for Singapore. It is administered by the Singapore Network Information Centre. Registrations are processed via accredited registrars.

In 2011, two new internationalized country code top-level domains were registered for Singapore, intended for domain names in the local languages. These domains will get domain names and working sites during 2011. These domains are .新加坡 (encoded as .xn--yfro4i67o) and .சிங்கப்பூர் (encoded as .xn--clchc0ea0b2g2a9***). The time plan is (or was) to begin accepting applications from existing domain owners in July 2011 and to activate them in September 2011.