Saint-Louis (French pronunciation: [sɛ̃ lwi]; Reunionese Creole: Sin Loui) is the fifth-largest commune in the French overseas department of Réunion.

It is located on the southwest part of the island of Réunion, adjacent to Saint-Pierre.

The average annual rainfall is 1,161.6 mm (45.73 in) with January as the wettest month.

The temperatures are highest on average in February, at around 25.2 °C (77.4 °F), and lowest in July, at around 19.0 °C (66.2 °F).

This Réunion location article is a stub.