Hannibal is an American psychological horror-thriller television series developed by Bryan Fuller for NBC. The series is based on characters and elements appearing in Thomas Harris' novels Red Dragon (1981), Hannibal (1999), and Hannibal Rising (2006) and focuses on the relationship between Federal Bureau of Investigation (FBI) special investigator Will Graham (Hugh Dancy) and Dr. Hannibal Lecter (Mads Mikkelsen), a forensic psychiatrist destined to become Graham's most cunning enemy and, at the same time, the only person who can understand him.

The series received a 13-episode order for its first season. David Slade executive produced and directed the first episode. The series premiered on NBC on April 4, 2013. On May 9, 2014, NBC renewed Hannibal for a third season, which premiered on June 4, 2015. On June 22, 2015, NBC canceled Hannibal after three seasons because of low viewership. The series finale aired in Canada on City, on August 27, 2015, and aired two days later in the U.S. on NBC.

The series received critical acclaim, with the performances of the lead actors and the visual style of the show being singled out for praise. The first two seasons each won the Saturn Awards for Best Network Television Series, while both Mikkelsen and Dancy won Best Actor, with Laurence Fishburne winning Best Supporting Actor for season two. The third and final season won the inaugural Best Action-Thriller Television Series award, while guest star Richard Armitage won Best Supporting Actor. The show has garnered a cult following and is considered by critics and audiences as one of the best series of the horror genre, and one of the greatest network TV series of all time.