Nefarious may refer to:

People Charles Lescewicz, bassist for the band Macabre, known as Nefarious X-Raided (born 1974), American rapper once credited under the pseudonym Nefarious

Fictional characters Count Nefarious, a Toonstruck character Doctor Nefarious, a Ratchet & Clank character Doctor Nefarious Tropy, a Crash Bandicoot character

Entertainment Nefarious (video game), a 2017 video game Nefarious: Merchant of Souls, a documentary film Nefarious (film), a 2023 horror film

Music Nefarious (EP), an indie rock album "Nefarious" (song), a 1996 indie rock song

See also