The Federation of Saint Kitts and Nevis (pronounced /seɪnt ˌkɪts ænd ˈniːvɪs/, also known as the Federation of Saint Christopher and Nevis), is a federal nation made up of two small islands in the Caribbean Sea. It is the smallest independent country in the Western Hemisphere.

The capital city is Basseterre. It is on the main island of St Kitts, also called Saint Christopher. The island of Nevis has some rights of self-government and two seats in the federal parliament.

St Kitts and Nevis is about one-third of the way from Puerto Rico to Trinidad and Tobago.

The headquarters of the Eastern Caribbean Central Bank is in St Kitts. That bank controls the East Caribbean dollar.