The Copa Santander Libertadores de América (Brazilian Portuguese: Copa Santander Libertadores da América), known simply as the Copa Libertadores and originally known as the Copa Campeones de América (English: Champions of America Cup; Brazilian Portuguese: Copa Campeões da América), is an annual international club football competition organized by CONMEBOL since 1960. It is the most prestigious club competition in South American football and one of the most watched events in the world, broadcast in 135 nations worldwide. The tournament is named in honor of the Libertadores (Portuguese and Spanish for Liberators), the main leaders of the South American wars of independence, so a literal translation of its name into English would be the "Santander Liberators of America Cup".

The competition has had several different formats over its lifetime. Initially, only the champions of the South American leagues participated. In 1966, the runners-up of the South American leagues began to join; in 1998, Mexican teams were invited to compete. Today at least three clubs per country compete in the tournament, while Argentina and Brazil each have five clubs participating. Traditionally, a group stage has always been used but the amount of teams per group has varied several times.

Libertadores (Spanish: [liβertaˈðoɾes], Portuguese: [libeʁtaˈdoɾis], "Liberators") refers to the principal leaders of the Latin American wars of independence from Spain and Portugal. They are named that way in contrast with the Conquistadors, who were so far the only Spanish/Portuguese peoples recorded in the South American history.^{[clarification needed]}

They were largely bourgeois, criollos (local-born people of European, mostly of Spanish or Portuguese, ancestry) influenced by liberalism and in most cases with military training in the metropole (mother country).

The four liberators identified as among the most prominent by both Robert Harvey and Felipe Pigna are:

The flags of Venezuela, Colombia and Ecuador follow Francisco de Miranda's design of 1806. Also, Bolivia was named after Bolivar, who in turn was president of Colombia, Bolivia and twice of Venezuela. San Martín served as "President Protector" of Peru.

Liberators' names were used all over South America to name anything from towns and places to institutions and sports clubs. Also, the most prestigious international club football competition in South America is named the Copa Libertadores in their honour.

The terms Old Boys and Old Girls are the usual expressions in use in the United Kingdom for former pupils or alumni of primary and secondary schools. While these are traditionally associated with independent schools, they are also used for some schools in the state sector. The term is also used for those who attended New Zealand schools, Sri Lankan schools, a few universities in the UK and, to a lesser extent, schools in Australia, Canada and South Africa.

The Old Boy form is given a specific identification for each school. Some schools use an adjectival form of the school name, such as "Old Etonian", "Old Harrovian", or "Old Reptonian" (old boys of Eton College, Harrow School, and Repton School). Some use a Latin form derived from the Latin name of the school or its location as "Old Novocastrian" (old boys of the Royal Grammar School, Newcastle upon Tyne). Some are based on the name of the founder, such as "Old Wykehamist" and "Old Alleynian" (for old boys of Winchester College, founded by William of Wykeham, and Dulwich College, founded by Edward Alleyn). Some are based on the school's location or street, such as "Old Gowers" (for University College School, originally in Gower Street). Many of the schools have histories dating back several hundred years, and the Old Boy forms may have been in use for a hundred years or more. Other more recently established schools have devised Old Boy names that are distinctive to prevent confusion with other schools. The tradition for many girls schools has been to use the term "Seniors" rather than "Old Girls".