Light Years is the seventh studio album by Australian singer Kylie Minogue. It was released on 25 September 2000 by Parlophone. The album's style was indicative of her return to "mainstream pop and dance tunes". It received favourable reviews from music critics, with some appreciating her fresh new pop roots and electronic music. Two weeks after debuting at number two on the Australian Albums Chart, the album reached the top position, making it Minogue's first number-one album in her native Australia. It was later certified four times platinum by the Australian Recording Industry Association (ARIA). Minogue promoted the album with television performances and interviews. It was further promoted with the On a Night Like This Tour, which visited Europe and Australia.
 
In Australia, Light Years debuted at number two on the ARIA Albums Chart on 2 October 2000. Three weeks later, the album rose to number one, becoming Minogue's first number-one album in her home country. It spent 41 weeks in the top 50 and subsequently received a quadruple-platinum accreditation from the Australian Recording Industry Association (ARIA) for sales of over 280,000 copies. The album debuted and peaked at number two on the UK Albums Chart and was certified platinum by the British Phonographic Industry (BPI), denoting shipments in excess of 300,000 units. Elsewhere, the album reached number eight in New Zealand, number 16 in Hungary, number 24 in Finland, number 26 in Sweden, number 28 in Switzerland, and number 35 in Germany.
 
The album debuted at number two on the UK Albums Chart during the week of 7 October 2000, behind Madonna's Music. On 9 February 2001, it was certified platinum by the British Phonographic Industry (BPI) for shipments of more than 300,000 units. When Fever was released in October 2001, Light Years had stayed on the top 100 for 27 non-consecutive weeks. From January to May 2002, the album re-entered the chart and stayed for 11 weeks. In 2018, the reissue of Light Years peaked at number 36 on the UK Albums Chart on 7 June; it was the third best-selling vinyl album of the week. That same week, the reissue also appeared on the Scottish Albums Chart, reaching number 21—Light Years had previously peaked at number 3 there after its original release in 2000. In Ireland, the album spent 5 weeks on the chart and peaked at number 13.
According to Music & Media, Light Years peaked at number 10 on the European Top 100 Albums chart. The album peaked within top 40 in several European countries, including Belgium, Finland, Germany, Hungary, Poland, Swedish, and Switzerland. Light Years also reached number 50 in France, and number 71 in Netherlands. In South Africa, the album peaked at number 11 and was certified double platinum by the Recording Industry of South Africa for shipments of 100,000 copies.