Holidays and Observances
Alphabetical Listing of O Holidays

Below, you can find a Holidays and Observances Alphabetical Listing of US Holidays and World Holidays and Observances that start with O.  We are still adding names to the list, so more information will be coming. 

After we complete the summary pages on the site, we will start working on a detailed page(s) for each Holidays and Observance. Once a page is completed for each Holiday or Observance, it will be linked up below, as well as it's related Daily Holidays page. (that should keep us busy for the next 20 years or so!!)

Search for Holidays Alphabetically:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, N-Pg2 O, P, Q, R, S, T, U, V, W, X-Y-Z

Organic Harvest Month is the Entire Month of September! I've been growing my own Organic Vegetables over the last couple of years. Not only does it save a lot of money, but there is nothing better than going outside to pick stuff for dinner! This was one day's haul - with this many tomatoes, I took off the skins and ran everything through my juicer.  I was then able to freeze the juice/pulp in freezer quart size bags which are perfect for taking out to make pasta sauce or any type of soup. For excess zucchini - I peeled them and just grated them and put in freezer baggies to add to soups and sauces.

O Holidays and Observances

• O. Henry Pun-Off Day - May 10, 2025

• Oatmeal Cookie Day - May 18

• Oatmeal Monday - February 10, 2025 (Second Monday in February)

• Oatmeal Month - January

• Oatmeal Nut Waffles Day - March 11

• Observe the Weather Day - January 25

• Occult Day - November 18

• Occupational Safety and Health Professionals Day - May 7, 2025

• Occupational Therapy Day - October 27

• Occupational Therapy Month - April

• Odd Day - (Last one was 9-11-13 - three consecutive odd numbers)

• Odd Socks Day - September 5, 2025 (in Australia) 

• Odie Day - August 8 (Garfield's Friend)

• Office Chocolate Day - October 20

• Official Lost & Found Day - December 12, 2025 (Second Friday in December)

• Oglethorpe Day - February 12

• OK Day - March 23
  

• Oklahoma City Bombing Commemoration Day - April 19

• Oklahoma Day - April 22

• Okra Month - June

• Oktoberfest - September 20, 2025 - October 5, 2025 Beer Festival in Munich, Germany. This festival is now held all over the World. Also, check out our Holidays in Germany page!

• Old Clem's Night - November 23

• Old Farmers Day - October 12

• Old Inauguration Day - March 4

• Old Maid's Day - June 4

• Old New Year's Day - March 25
  

• Old Rock Day - January 7

• Old Time Fiddlers Week - June 15-21, 2025 (Third Week in June)

• Old Time Player Piano Day - May 27

• Old Time Player Piano Weekend - May 23-25, 2025 (Memorial Day Weekend)

• Older Americans Mental Health Week - May 25-31, 2025 (Last Full Week in May)

• Older Americans Month - May

• One Boston Day - April 15

• One Day Without Shoes Day - May 10

• One-Liners Day - January 21

• One-on-One Month - September

• One Voice Day - July 26

• Onion Month - August

• Open that Bottle Night - February 22, 2025 (Last Saturday in February)
  

• Opera Day - February 8

• Operating Room Nurse Awareness Week - November 9-15, 2025

• Operating Room Nurse Day - November 14

• Operation Iraqi Freedom Day - March 19

• Operation Red Wings Observance - June 28

• Operation Safe Driver Week - July 13-19, 2025

• Operation Santa Paws - December

• Opposite Day - January 25
  

• Oral, Head and Neck Cancer Awareness Week - April 6-12, 2025

• Orange Chicken Day - July 15

• Orange Month - August
  

• Orange Shirt Day - September 30

• Orangemen's Day - July 12

• Oranges and Lemons Day - March 20, 2025 (Third Tuesday in March)
  

• Orangutan Caring Week - November 9-15, 2025

• Organ / Tissue Donor Awareness Week - April 20-26, 2025 (Last Full Week of April)

• Organic Beer Fest - June 25-27

• Organic Harvest Month - September

• Organize Your Home Day - January 14

• Organize Your Home Office Day - March 11, 2025 (Second Tuesday in March)
  

• Organize Your Medical Information Month - October

• Origami Day - November 11

• Orphan Sunday - November 9, 2025 (Second Sunday in November)

• Orthodox Christmas Day - January 7

• Orthodox Easter - April 20, 2025 

• Orthodox Easter Monday - April 21, 2025
  

• Orthodox Forgiveness Sunday - March 2, 2025

• Orthodox Good Friday - April 18, 2025

• Orthodox Green Monday - March 3, 2025

• Orthodox Holy Saturday - April 19, 2025
  

• Orthodox Holy Week - April 13-21, 2025 

• Orthodox Lent - March 3, 2025 - April 19, 2025

• Orthodox Meatfare Sunday - February 23, 2025

• Orthodox New Year - January 14
  

• Orthodox Palm Sunday - April 13, 2025

• Orthodox Pentecost - June 8, 2025

• Oscar the Grouch Day - June 1

• Ostara - March 20, 2025 (Spring Equinox) 

• Osteoporosis Prevention Month - May

• Ovarian Cancer Awareness Month - September

• Own Business Day - October 14, 2025 (Second Tuesday in October)

• Own Your Own Home Day - January 21

• Own Your Share of America Day - June 13, 2025 (Closest Weekday to June 14)

• Oyster Day - May 5

Search for Holidays Alphabetically:

A, B, C, D, E, F, G, H, I, J, K, L, M, N, N-Pg2 O, P, Q, R, S, T, U, V, W, X-Y-Z

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