"Adeste Fideles" is a Christmas carol which for some time has been attributed to John Francis Wade in the English-speaking world. However, many other probable authors exist and the oldest manuscripts of this hymn have been found in a royal library in Portugal, with a date prior to Wade's collection.

The original four verses of the hymn were extended to a total of eight, and these have been translated into many languages. The English translation of "O Come, All Ye Faithful" by the English Catholic priest Frederick Oakeley is widespread in most English speaking countries.