Water polo competitions

The LEN Challenger Cup is a water polo club competition organised by the Ligue Européenne de Natation (LEN). It acts as the third tier, below the LEN Champions League and the LEN Euro Cup. GS Apollon Smyrnis of Greece became the first champions, defeating CN Terrassa of Spain in the final.

The Yugoslav Water Polo Championship was the premier league competition for men's water polo clubs in Yugoslavia. Originally established in 1921 in the Kingdom of Yugoslavia, it ran for almost 20 years before being suspended due to the Second World War and the Invasion of Yugoslavia.

The Greek Women's Water Polo Super Cup is a Water Polo club competition in Greece since 2020. It is an annual match contested between the Greek A1 Ethniki Women Champion and the Cup Winner of the same year. The matches take place in different locations every time. Olympiacos has the most Super Cups.

The COMEN (COnfederación MEditerránea de Natación) Cup was a competition in the sport of water polo, organized by the Mediterranean Swimming Confederation the period from 1984 to 2007. Participation rights had clubs from European, African and Asian countries bordering the shores of the Mediterranean Sea like Spain, France, Italy, Malta, Greece, Cyprus, Egypt, Yugoslavia and after her split Croatia, Montenegro and Serbia. Ιn addition there was the possibility of participation of clubs that did not qualify, simply as visitors.

The Asian Water Polo Clubs Championships are the premier Asian water polo club competitions run by the Asia Swimming Federation.