A virus is a parasitic agent that is smaller than a bacterium and that can only reproduce after infecting a host cell. Virus may also refer to:

Computer virus, a type of malicious computer program

Viruses, the main enemies in the Mega Man Battle Network video game series.

List of viruses, a list of many known viruses.

Virus, A sniper unit in Yuri's faction, from Command & Conquer: Yuri's Revenge

The lead guitarist of Dope

Virus (1980 film) or Fukkatsu no hi, a post-apocalyptic sci-fi film

Access Virus, a German line of analog modeling synthesizers

See also the plural of virus.

The Virus, a punk band from the United States

Virus (1999 film), a sci-fi/horror film

Virus is a song by German singer LaFee

Mobile virus, a type of malicious cell phone program

Virus (album), an album by Hypocrisy

Virus (computer game), a computer game by David Braben

Virus (Argentine band)

Virus (Russian band)

Virus (Heavenly album)

A song by Avail from Dixie

Virus (band), a band from Norway

Virus (comic book), a Dark Horse miniseries

Virus Recordings, a record label.

"Virus", a song by Iron Maiden

"Virus", a song by KMFDM

"Virus Alert", a song by Weird Al Yankovic

Virus, an infamous dance club in the small, secluded town of Nagua in the Dominican Republic