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Peter Hermann (born August 15, 1967) is an American actor. He may be best known for his roles as Charles Brooks in Younger, Trevor Langan in Law & Order: Special Victims Unit, and Jack Boyle in Blue Bloods. Hermann is the husband of fellow Law & Order franchise actor Mariska Hargitay, series lead of Law & Order: Special Victims Unit.
| Year | Film | Role | Notes |
| 2002 | Swimfan | ER Doctor | |
| 2004 | Duane Incarnate | Duane | |
| 2006 | The Treatment | Steve | |
| United 93 | Jeremy Glick | ||
| 2010 | Edge of Darkness | Sanderman | |
| Just Wright | Dr. Taylor | ||
| 2011 | Too Big to Fail | Christopher Cox | |
| 2012 | Trouble with the Curve | Greg | |
| 2013 | Philomena | Pete Olsson | |
| Chinese Puzzle | John | ||
| All Is Bright | Monsieur Tremblay | ||
| 2022 | 13 | Joel Goldman | |
| Goodnight Mommy | Father |
| Year | Film | Role | Notes |
| 1997–1998 | Guiding Light | Dr. Michael Burke | 42 episodes |
| 1999 | Get Real | David | 3 episodes |
| 2000 | Law & Order | Al Goran | Episode: "Mega" |
| Spin City | Ed | Episode: "Don't Get on the Bus" | |
| 2002 | Hack | Mark Vincenzo | Episode: "Obsession" |
| 2002–2022 | Law & Order: Special Victims Unit | Trevor Langan | 34 episodes |
| 2003 | Sex and the City | David | Episode: "Hop, Skip and a Week" |
| All My Children | Wayne Kabak | Episode: "August 22, 2003" | |
| 2005 | Hope & Faith | Brent | Episode: "The Halloween Party" |
| 2006 | Beautiful People | Luke Dalton | 6 episodes |
| Standoff | Liam Fowler | Episode: "Shanghai'd" | |
| Angela's Eyes | Peter Wagner | 4 episodes | |
| 2007 | 30 Rock | Gray | Episode: "The Head and the Hair" |
| 2008 | Cashmere Mafia | Davis Draper | 7 episodes |
| Fringe | Grant | Episode: "The Ghost Network" | |
| 2009 | Bored to Death | Gary | Episode: "The Alanon Case" |
| 2010 | The Good Wife | Judge Derek Shickel | Episode: "Hybristophilia" |
| White Collar | Willson Mailer | Episode: "Parting Shots" | |
| 2011 | Curb Your Enthusiasm | Business Manager | Episode: "Car Periscope" |
| 2011–2012 | A Gifted Man | Harrison Curtis | 5 episodes |
| 2012–2024 | Blue Bloods | Jack Boyle | Recurring |
| 2013 | Elementary | Detective Craig Basken | Episode: "An Unnatural Arrangement" |
| 2015–2021 | Younger | Charles Brooks | Series regular |
| 2023 | And Just Like That... | George Campbell | Episode: "Trick or Treat" |