Louis of Naples may refer to:

• Louis of Toulouse, a saint
• Louis I of Naples, also known as Louis of Taranto
• Louis I of Anjou, titular king of Naples as Louis I
• Louis II of Anjou, king of Naples as Louis II
• Louis III of Anjou, titular king of Naples as Louis III

• Costapex levis
• Costapex margaritatus
• Costapex martinorum
• Costapex sulcatus
• Costa Poetry Award
• Costa Prasoulas
• Costa precoding
• CO-STAR
• Costa Rica and the World Bank
• Costa Rica at the 1992 Summer Paralympics
• Costa Rica at the 2015 World Championships in Athletics
• Costa Rica at the 2016 Summer Paralympics
• Costa Rica at the 2017 Summer Universiade
• Costa Rica at the 2017 World Aquatics Championships
• Costa Rica at the 2017 World Championships in Athletics
• Costa Rica at the 2018 Summer Youth Olympics
• Costa Rica at the 2019 Pan American Games
• Costa Rica at the CONCACAF Gold Cup
• Costa Rica at the Summer Olympics
• Costa Rica at the Winter Olympics
• Costa Rica (El Salvador, Cuba)
• Costa Rica holiday
• Costa Rica holidays
• Costa Rica-Iceland relations
• Costa Rica-India relations