Old Guy is a 2024 American action comedy film directed by Simon West, written by Greg Johnson, produced by Martin Brennan and Jib Polhemus, and Dark Castle Entertainment.

Filmed on location in Northern Ireland and starring Christoph Waltz, Lucy Liu, and Cooper Hoffman.

Old Guy premiered at the Newport Beach Film Festival on October 17, 2024, and is scheduled to be released in the United States on February 21, 2025.

A contract killer on the verge of retirement due to arthritis is given a new chance at fieldwork training Wihlborg, a prodigy assassin with an attitude.

The subsequent mission to Northern Ireland is complicated by concerns that Wihlborg is part of a plan to literally eliminate the older guard in favour of a new generation.