Ari Haswari was a villain that appeared on the TV show NCIS. He was a rogue Mossad officer and sworn nemesis of Leroy Jethro Gibbs who tormented Gibbs and his team for the first three seasons of the show.

In addition to having launched numerous attacks against the Major Case Response Team, Ari, already a thorn in the team's side became a very real threat when he killed NCIS Special Agent Caitlin Todd by shooting her in the head in the last few seconds of the Season 2 finale, "Twilight".

Ari's wave of terror which had started when he invaded the NCIS morgue, triggering a hostage situation and continued for nearly two years finally came to an end when he was ultimately killed in a confrontation with Gibbs and Ari's fellow Mossad Officer/half-sister Ziva David who later joined the team, replacing the deceased Kate Todd.

However, even in death, Ari continued to haunt the team by proxy. His death caused several future villains to seek revenge against Gibbs and the NCIS team, sometimes with fatal results.