Just Louis Fontaine (born 18 August 1933) is a Moroccan-born French former professional footballer. A prolific forward, he is best known for scoring the most goals in a single edition of the FIFA World Cup, with thirteen in six matches in 1958.

In 2004, Pelé named him one of the 125 Greatest Living Footballers at a FIFA Awards Ceremony. Born in Marrakech to a French father and a Spanish mother, Fontaine moved to Casablanca, where he attended the Lycée Lyautey. Fontaine began his amateur career at USM Casablanca, where he played from 1950 to 1953.