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Luke Timothy Grimes (born January 21, 1984) is an American actor and musician. He is known for his role as Navy SEAL Marc Alan Lee in the film American Sniper. He played Christian Grey's little brother, Elliot, in the film Fifty Shades of Grey (2015), and its sequels, Fifty Shades Darker (2017) and Fifty Shades Freed (2018). He starred as Kayce Dutton in the Paramount Network drama series Yellowstone (2018–2024).
| Year | Title | Role | Notes |
| 2006 | All the Boys Love Mandy Lane | Jake | |
| 2007 | War Eagle, Arkansas | Enoch | |
| 2008 | Assassination of a High School President | Marlon Piazza | |
| 2010 | Shit Year | Harvey West | |
| 2011 | The Wait | Ben | |
| The Light in the Night | Boy | Short film | |
| 2012 | Taken 2 | Jamie | |
| 2013 | Stars | Evan | |
| 2014 | Squatters | Michael Silverman | Direct to video |
| American Sniper | Marc Lee | ||
| 2015 | Fifty Shades of Grey | Elliot Grey | |
| Shangri-La Suite | Jack Blueblood | ||
| Freeheld | Todd Belkin | ||
| Forever | Charlie | ||
| 2016 | Manhattan Undying | Max | |
| 2016 | The Magnificent Seven | Teddy Q | |
| 2017 | Fifty Shades Darker | Elliot Grey | |
| El Camino Christmas | Eric Roth | ||
| 2018 | Fifty Shades Freed | Elliot Grey | |
| 2019 | Into the Ashes | Nick Brenner | |
| 2023 | Happiness for Beginners | Jake | |
| 2025 | Eddington | Guy |
| Year | Title | Role | Notes |
| 2009–2010 | Brothers & Sisters | Ryan Lafferty | Guest (season 3)Main cast (season 4) |
| 2012 | Outlaw Country | Eli Larken | TV movie |
| 2013 | True Blood | James | 6 episodes |
| 2018–24 | Yellowstone | Kayce Dutton | Main roleNominated: Screen Actors Guild Award for Outstanding Performance by an Ensemble in a Drama Series |
| 2026 | Y: Marshals | Main role |