Ultraman Mebius (ウルトラマンメビウス, Urutoraman Mebiusu) is a Japanese television series produced by Tsuburaya Productions and Chubu-Nippon Broadcasting. It is the 20th TV series and 40th anniversary production in the Ultra Series, which first began in 1966. It premiered on the Tokyo Broadcasting System on April 8, 2006. Unlike the two prior entries, Ultraman Nexus (2004) and Ultraman Max (2005), Mebius was moved from Saturday mornings to Saturday evenings at 05:30 and the show went on to air in Korea in April 2012.

On October 22, 2014, Crunchyroll announced that the entire series would be available that day on their streaming service for the US, Canada, Latin America, Mainland Europe (except France, Belgium, Netherlands, Luxembourg, Italy, Switzerland, Germany and Austria, Spain, Portugal, Andorra, Monaco, Liechtenstein and Former Communist and Non-communist states in Eastern Europe (eg, Central, Post-Soviet states in Europe and Southeastern Europe), and Finland, Iceland and Norway, Denmark and Sweden), UK and Ireland, Australia, and New Zealand. On February 26, 2018, Toku announced that they would broadcast the series in the United States on their television channel, starting on March 19, 2018.

The series opens with the introduction of the rookie Ultraman Mebius, who is sent to Earth by the Father of Ultra. The series is set 40 years after the shows of Ultraman (1966), and makes many references from Ultra Q (1966) through to Ultraman 80 (1980). "Mebius" is the Japanese approximation of Möbius; the Möbius strip is a recurring motif in the series.