The Office
A full list of special holiday episodes

The Office
9 seasons, 2005–2013
This mockumentary-style workplace sitcom follows the daily lives of the employees at a paper company led by the quirky and clueless boss Michael Scott.
The show aired 7 Christmas episodes, 4 Halloween episodes, and 4 Valentine's Day episodes.
Christmas episodes:

Season 2, Episode 10
Christmas Party
In an effort to save the office Halloween party from boredom, Michael defies corporate policy and buys alcohol for the staff.

Season 3, Episode 10
A Benihana Christmas
Pam and Karen host a rival Christmas party after trouble arises within the party planning committee, but Michael is not interested in celebrating as he was recently dumped by Carol.

Season 5, Episode 10
Moroccan Christmas
At the office Christmas party, Phyllis blackmails Angela to take over the planning, while Dwight monopolizes a popular Christmas gift. Meredith gets drunk and sets her hair on fire, leading to an intervention from Michael.

Season 6, Episode 13
Secret Santa
Michael is upset when Jim promises Phyllis the role of office Santa, while bad news from David Wallace threatens to overshadow the Christmas party.

Season 7, Episode 11
Classy Christmas
Michael throws a Christmas party to welcome Holly back to the Scranton branch, but is disappointed to learn she still has a boyfriend.

Season 8, Episode 10
Christmas Wishes
Andy tries to fulfill everyone's Christmas wishes, while Robert California drowns his sorrows at the office party

Season 9, Episode 9
Dwight Christmas
Dwight throws a Pennsylvania Dutch Christmas party but ends it early due to Jim's other job. Erin seeks comfort from a co-worker after a disappointing text from Andy.
Halloween episodes:

Season 2, Episode 5
Halloween
Corporate pressure Michael to fire an employee, casting a shadow over the office Halloween party.

Season 7, Episode 6
Costume Contest
Halloween at Dunder Mifflin, Michael is upset with Darryl. Jim and Pam try to figure out why Danny didn't call Pam back four years ago.

Season 8, Episode 5
Spooked
Erin fears she'll be fired after planning a disastrous Halloween party for Robert and his son. Meanwhile, Robert challenges the staff to come up with the perfect spooky story.

Season 9, Episode 5
Here Comes Treble
Andy hosts the Cornell a Capella group on Halloween, while Dwight discovers that Nellie takes anxiety pills and Pam disapproves of Jim's business decision.
St. Valentine's Day episodes:

Season 2, Episode 16
Valentine's Day
Michael visits Dunder Mifflin corporate headquarters in New York with Jan, and they both get surprised. Scranton office celebrates Valentine's Day in a grade school style.

Season 7, Episode 15
PDA
Michael and Holly's PDA annoys the office, Erin solves Gabe's riddles to find her gift from Andy, and Jim and Pam get drunk and try to find a private place in the office.

Season 8, Episode 14
Special Project
Andy assigns Dwight to lead a special project in Tallahassee, but Dwight is not pleased with the team Andy has put together. Meanwhile, Darryl is trying to decipher the meaning of Val's Valentine's gift.

Season 9, Episode 15
Couples Discount
Andy comes back to a hostile work environment and a furious girlfriend after being gone for three months. Meanwhile, Jim's Valentine's Day plans with Pam don't go according to plan.