Collectors' Item: All Their Greatest Hits! is a compilation album released by Harold Melvin & the Blue Notes on the Philadelphia International record label in July 1976. It includes all of their biggest hits with the label recorded between 1972 and 1975, such as "If You Don't Know Me by Now", "The Love I Lost", Bad Luck", and "Wake Up Everybody". Many of the songs were in extended versions. The album, produced by Gamble & Huff, sold over a million in the USA. The UK album release also included the track, "Satisfaction Guaranteed" which had been a big hit for the group there.