The word Ultra can have several meanings:

• Ultra was a codename for certain cryptographic intelligence in World War II.
• ULTRA is the abbreviation for the Unrelated Live Transplant Regulatory Authority ^*.
• Ultra (company) was a subsidiary of Konami of America created to publish video games for NES game console.
• Sun Ultra series is the name of a range of computer workstations and servers sold by Sun Microsystems.
• ULTra (PRT) is a personal rapid transit proposal currently under construction at Heathrow airport.

Words and phrases:

• ultra- is a prefix, from Latin, meaning "beyond". Examples of "ultra" words are ultraviolet, ultrasonic, and ultraconservative.
• Ultras are another name for organized supporters of a sports team.
• Ultra (Malaysia) is a phrase once used to refer to racial extremists in Malaysia.

In fiction:

• The Ultras (Revelation Space) are a faction of humanity in Alastair Reynolds's Revelation Space hard science fiction universe
• "Ultras" are the general name for superheroes in Malibu Comics' Ultraverse.
• Ultraman (comics) is a DC Comics supervillain.
• The Ultra (comics) comic book from Image Comics.
• Ultraman is a Japanese superhero, the protagonist of a live action television program of the same name.

In music and entertainment:

• Ultra Music Festival is the name of an annual electronic music festival held in Miami, Florida.
• Ultra (album) is also the title of a Depeche Mode album.
• Ultra (band) is a band whose members include Kool Keith.
• Ultra (boy band) is also the name of a boy band from the UK.
• Ultra is a song performed by KMFDM.
• Ultra (video game) is a video game feature in the fighting game genre.
• The Ultra (board game) newsletter for the Advanced Third Reich board wargame.

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