Ultraman Cosmos (ウルトラマンコスモス, Urutoraman Kosumosu) is a Japanese tokusatsu TV series being the twelfth entry (seventeenth overall) show in the Ultra Series. Produced by Tsuburaya Productions, Ultraman Cosmos aired from July 7, 2001 to September 28, 2002, with a total of 65 episodes, which currently makes it the longest running Ultra show to date. It was also released to celebrate the 35th anniversary of the Ultraman series.

In June 2002, Cosmos was taken off of television for several weeks (following the broadcast of the 49th episode) when lead actor Taiyou Sugiura was questioned in an assault and extortion case. When the case against Sugiura was dropped for lack of evidence, Cosmos was put back on the air. MBS, TBS and Tsuburaya ultimately pulled five episodes (50, 52, 54, 56, and 58) from broadcast to make up for time lost, and these episodes were later released on DVD.

In April 2017, the television channel TOKU announced that they would release the series in the United States in the near future. A year later, the series was released by the channel on April 23, 2018.