Kacey Mottet Klein is a Swiss actor. He made his screen acting debut at the age of ten in Ursula Meier's "Home", winning a Swiss Film Award for Best Emerging Talent. He followed this with another Swiss Film Award for Best Actor and a César nomination for the lead in Meier's "Sister".
| Movie | De Gaulle - Partie 1 : La France Libre | 2026 | |
| Movie | The Lost Princess | Mr. Cohen | 2025-10-16 |
| Movie | All For One | Richelieu | 2025-01-22 |
| Series | The Sentinels | De Clermont | 2025-09-29 |
| Movie | A Violent World | Sam Damy | 2025-01-29 |
| Movie | Last Dance | Samir | 2023-02-01 |
| Movie | The Vourdalak | Marquis Jacques Antoine Saturnin d'Urfé | 2023-10-25 |
| Movie | High Fever | Kacey | 2022-01-22 |
| Movie | Lonely Fans | Laurent | 2022-09-09 |
| Movie | Ride Above | Sébastien | 2022-12-21 |
| Movie | Happening | Jean | 2021-11-04 |
| Movie | Death and the Winemaker | The Winemaker | 2021-07-03 |
| Movie | Just Kids | Jack | 2020-08-05 |
| Movie | Farewell to the Night | Alex | 2019-04-24 |
| Movie | Northern Wind | Vincent | 2018-01-10 |
| Movie | Kings for a Day | Micka | 2018-05-02 |
| Movie | Keep Going | Samuel | 2018-09-13 |
| Movie | Diary of My Mind | Benjamin Feller | 2018-01-27 |
| Movie | The Royal Exchange | Don Luis | 2017-12-27 |
| Movie | Being 17 | Damien Delille | 2016-02-27 |
| Movie | A Mother | Guillaume | 2015-06-24 |
| Movie | Warriors | Thomas | 2015-01-01 |
| Movie | Kacey Mottet Klein, Birth of an Actor | Self | 2015-11-07 |
| Movie | Keeper | Maxime | 2015-09-13 |
| Movie | Gemma Bovery | Julien Joubert | 2014-09-10 |
| Movie | Cadrage/débordement | Rico | 2013-12-09 |
| Movie | The Suicide Shop | Alan Tuvache (voice) | 2012-09-26 |
| Movie | Sister | Simon | 2012-04-04 |
| Movie | Gainsbourg: A Heroic Life | Lucien Ginsburg | 2010-01-20 |
| Movie | Home | Julien | 2008-10-29 |