"Seasons" (capitalized as "SEASONS") is a song recorded by Japanese recording artist Ayumi Hamasaki for her third studio album, Duty (2000). It was written by Hamasaki, while production was handled by Max Matsuura. It premiered on June 7, 2000 as the third single from the album. The song is the final part of a trilogy from Duty; the other two singles being "Vogue" and "Far Away".

Musically, "Seasons" is a Japanese pop song. The lyrics highlights theme of the hopelessness, describing Hamasaki's future. Upon its release, the track garnered rave reviews from music critics, who praised Hamasaki's songwriting, the song's composition and selected it as an album and career stand out track. It also achieved success in Japan, peaking at number one on the Oricon Singles Chart and on the TBS Count Down TV chart. "Seasons" has sold over 1.367 million units in Japan, making it Hamasaki's best selling single.

The accompanying music video for "Seasons" was directed by Wataru Takeishi, and leads on from the videos of "Vogue" and "Far Away"; it features Hamasaki in a black gown in the middle of a post-apocalypse city. Both the music video and the song has appeared on several compilations by Hamasaki, including A Best (2001) and A Complete: All Singles (2008). For additional promotion, the song was featured on several concert tours by Hamasaki.