The Crescent Cup, or the Islamic Nations Rugby Championship, is a men's rugby union tournament, organised by World Rugby and the Islamic Solidarity Sports Federation and featuring teams from the Muslim world.

The inaugural tournament was held in Malaysia in 2015.

It was co-organised with the Malaysia Rugby Union.

The hosts Malaysia are the current champions, having defeated Algeria in the final.

For each tournament, the number of teams in each finals tournament (in brackets) are shown.