Ultimate Kylie is the ninth greatest hits album by Australian recording artist Kylie Minogue, and her first greatest hits released under her contract with Parlophone, her record company since 2000. The compilation was released in many different formats including a two-disc edition and a deluxe double disc with a bonus DVD. A separate compilation DVD with the same name, was released to accompany the audio versions. The album includes two new tracks; its lead single, "I Believe in You", and the second single, "Giving You Up". A third track, "Made of Glass", was recorded for the album but not used; it was included on the physical releases of "Giving You Up".
Ultimate Kylie was commended by contemporary critics who noted the musical and credible progression from the start of her career; some critics criticized the earlier material. The album reached the top ten in the United Kingdom, Australia, Ireland, Greece, and Germany, while it charted in several other territories including Spain, Sweden, and New Zealand. The album was certified platinum by the International Federation of the Phonographic Industry (IFPI) for one million shipments throughout Europe. "I Believe in You" debuted inside the top ten in several countries worldwide, while "Giving You Up" charted moderately in some regions. The compilation was promoted through the Showgirl: The Greatest Hits Tour in 2005. After Minogue was diagnosed with breast cancer, she cancelled the tour and was resumed with another leg in 2006.