- After he found out he got the job on The Office, John traveled with his friends to Scranton and filmed several scenes that were eventually used in the opening credits.
- In August 2009, John got engaged to actress Emily Blunt. They have been dating since November 2008.
- John ranked No.76 in AfterElton.com's Hot 100 of 2007. In 2008, he moved ten places down to No.86. In 2008, he was ranked No. 76 in the Popsugar 100.
- John's father is a doctor at the same hospital where fellow The Office star Mindy Kaling's mother also works as a doctor.
- John's first directorial job was on the film adaptation of Brief Interviews with Hideous Men in 2006. He also co-wrote and appeared in the movie.
- John lost a $2,000 bet in a one-on-one basketball game against George Clooney, his director in the movie Leatherheads. Clooney did not take his money.
- If John can be invisible, he would like to spy on David Blaine and whisper in his ear, "I'm invisible. What can you do?".
- John once did a back-to-back marathon of Laguna Beach and The Hills.
- John appeared on the cover of the June 2007 edition of Mean Magazine . In December 2007, he was featured on the issue of Men's Health magazine.
- John is friends with the front man of the band Death Cab for Cutie, Ben Gibbard. He is also friends with David Schwimmer, with whom he worked in Duane Hopwood.
- John narrated a documentary about war called Operation Homecoming.
- John has homes in New York City and Los Angeles. He lives in LA while filming The Office.
- John and his castmates like to play video games on the set of The Office, and he has a reputation of being one of the best players on the cast.
- John, along with some other Office castmates, attended The Last Mimzy premiere to support their coworker Rainn Wilson.
- John and his Office castmates like to get together on Thursday nights to watch the show.
- John had a role in a film entered in the 2007 Sundance Film Festival called Smiley Face and starring Anna Faris. His other film projects include For Your Consideration (2006), Doogal (2006), and Dreamgirls (2006).
- John won a Screen Actors Guild Award along with the rest of The Office cast for Outstanding Performance by an Ensemble in a Comedy Series. They had consecutive wins in 2007 and 2008. They were nominated again in 2009.
- John can juggle.
- At one point in life, John used to be a bartender. He worked at Manhattan's Odeon. He was also a waiter at Sushi Samba.
- John was one of People Magazine's Sexiest Men Alive, 2006. He was named "Sexiest Office Cutup"
- John briefly dated Rashida Jones in early 2006. Beginning Fall 2006, she appears with a recurring role on The Office as Karen Filippelli.
- John has stated that he can't stand Jell-O, but that he loves chocolate pudding.
- John was the best man at his brother, Paul Krasinski's wedding to Ashley Russell.
- John's the shortest of his siblings at 6 feet and 3 inches. His oldest brother, Kevin, is a doctor and second oldest brother, Paul, is a strategic consultant. His brothers are 6 feet and 8 inches and 6 feet 9 inches respectively.
- John is Polish.
- He attended Newton South High School with B.J. Novak, co-writer and co-star of the hit television mockumentary, The Office. They were also on the same Little League baseball team.
- John does the voice-over for the Ask.com commercials and for Apple commercials promoting the i-TV. He also appeared in a Kodak commercial. John appeared in the winter 2007 Gap print ads. In 2008, he did voice-over work for the Blackberry commercials.
- John interned at Hill Holliday advertising agency and worked on various Dunkin' Donuts commercials. He also interned for Late Night with Conan O'Brien.
- John Krasinski: (regarding looking for a real-life Pam) It's not about celebrity or not. It's all about, do you have that 'girl in a cardigan' in you. You gotta have that.
- John Krasinski: I think one of the coolest things about the job is the level of trust we have for each other. The actors fully trust that the writers will write amazing episodes, and the writers trust that the actors will follow their instincts with the characters. So we're often asked our opinions on what we think of a joke or a moment. Is it funny? Is it believable? What do we think should happen? That's a very rare environment for actors to be in. It's great!
- John Krasinski: (on the Jim/Pam relationship on "The Office") I think the relationship in the office has been an interesting story to follow from the beginning. I can't give the writers enough credit for how incredibly realistic they have been with this storyline. It's an incredibly difficult thing to balance and they have dealt with it with such care and subtlety it's been amazing. And I think the reason for seeing more and more of the relationship on screen is that the documentary film crew in the show are now aware of the love interest and therefore paying more attention with the cameras.
- John Krasinski: (on being part of "Shrek the Third") Well, it's a tiny little franchise that I think is really going to catch on. It's gonna be a big deal for DreamWorks. Seriously, it's a blast. As a kid I always wanted to be a cartoon more than anything else. And I got my chance.
- John Krasinski: (on who the funniest cast member on "The Office" is) Each cast member brings their own vibe and antics to the set. You're constantly surrounded by fun loving people who can make you laugh in their own way. For instance, I don't think I've ever laughed so hard playing video games with Brian [Baumgartner], who plays Kevin.
- John Krasinski (on a book that changed his life): "To Kill a Mockingbird" by Harper Lee. It was the first time for me that a story really sunk in. The idea that at the end of the day, what will get you through any sort of prejudice is to rise above it.
- John Krasinski: Being funny is one of my greatest strengths. I can make girls smile when they're down, and when they're having a good time, I can carry on the joke.
- John Krasinski: Boston is actually the capital of the world. You didn't know that? We breed smart-ass, quippy, funny people. Not that I'm one of them. I just sorta sneaked in under the radar.
- John Krasinski: My name was originally John Collins, but I just didn't think it had the flair I needed. I found out the poet laureate of Poland was named Krasinski and so it seemed like a shoe-in for show business.
- John Krasinski: (on directing his own show) It might be a little weird. It would be like if you're at dinner with your family and telling them when they can eat. And you're like, 'Mom, not yet, you don't pass the salt yet! I'll tell you when to do that!'
- John Krasinski: The perfect gadget would somehow allow me to fly. Isn’t that what everybody wants? It would also cook a damn good microwave pizza. So while in flight you had something to eat—an in-flight meal. Where would I go? Well, nowadays, it would probably just take me to work a lot quicker.
- John Krasinski: I used to make fun of my friends who had BlackBerries. And I know that the expression CrackBerry has been going around, but now I fully understand it. I’m actually addicted to a piece of machinery, and that’s really embarrassing.
- John Krasinski My favorite water cooler topic is fantasy football. I used to make fun of friends for doing it and now I'm obsessed.
- John Krasinski: (on "The Office") For a while we were all thinking about applying to a restaurant close to the studio, so that at a moment's notice we could go work over there. I remember thinking, we get a DVD of this, right? At least I can prove to my mom that it happened. Now people actually care about it.
- John Krasinski: I'm really not feeling one way or the other with comedy or drama, I'm just sort of doing projects that I've been finding really fun to be a part of.
