| Year | Award | Category | Nominated work | Result |
| 2001 | Young Hollywood Award | One to Watch – Male | Life as a House | Won |
| National Board of Review of Motion Pictures | Best Breakthrough Performance by an Actor | Won |
| Golden Globe Awards | Best Supporting Actor – Motion Picture | Nominated |
| Screen Actors Guild Awards | Outstanding Actor in a Supporting Role – Motion Picture | Nominated |
| Dallas–Fort Worth Film Critics Association Awards | Best Supporting Actor | Nominated |
| Online Film Critics Society Awards | Best Breakthrough Performance | Nominated |
| Chicago Film Critics Association Awards | Most Promising Performer | Nominated |
| 2002 | Cannes Film Festival | Male Revelation | Star Wars: Episode II – Attack of the Clones | Won |
| Golden Raspberry Awards | Worst Supporting Actor | Won |
| Golden Raspberry Awards | Worst Screen Couple (shared with Natalie Portman) | Nominated |
| Saturn Awards | Best Performance by a Younger Actor | Nominated |
| Saturn Awards | Cinescape Genre Face of the Future Award | Nominated |
| Teen Choice Awards | Choice Movie Actor: Action | Nominated |
| Teen Choice Awards | Choice Movie: Chemistry (shared with Natalie Portman) | Nominated |
| Teen Choice Awards | Choice Movie: Liplock (shared with Natalie Portman) | Nominated |
| Teen Choice Awards | Choice Movie: Male Breakout Star | Nominated |
| 2003 | Las Palmas Film Festival | Best Actor (shared with Peter Sarsgaard) | Shattered Glass | Won |
| Satellite Awards | Best Actor – Motion Picture Drama | Nominated |
| 2005 | ShoWest | Male Star of Tomorrow | Star Wars: Episode III – Revenge of the Sith | Won |
| MTV Movie Awards | Best Villain | Won |
| Golden Raspberry Awards | Worst Supporting Actor | Won |
| Saturn Awards | Best Actor | Nominated |
| MTV Movie Awards | Best Fight (shared with Ewan McGregor) | Nominated |
| Teen Choice Awards | Choice Movie Actor: Action | Nominated |
| Teen Choice Awards | Choice Movie: Villain | Nominated |
| 2007 | Golden Raspberry Awards | Worst Screen Combo (shared with Jessica Alba) | Awake | Nominated |
| 2008 | MTV Movie Awards | Best Fight (shared with Jamie Bell) | Jumper | Nominated |
| 2010 | Black Reel Awards | Best Ensemble | Takers | Nominated |
| 2022 | Saturn Awards | Best Guest-Starring Performance in a Streaming Television Series | Obi-Wan Kenobi | Won |
| 2023 | Critics' Choice Super Awards | Best Villain in a Series | Nominated |