| 3rd Saturday in September |
Software Freedom Day |
|
| September 1 |
National Insurance Day (Sri Lanka)[168] |
Government of Sri Lanka |
| September 1 |
Random Acts of Kindness Day (New Zealand) |
|
| September 2 |
Victory over Japan Day (US) |
|
| September 3 |
Skyscraper Day |
|
| September 4 |
National Finnish Food Day (Finland) |
|
| September 5 |
International Day of Charity |
UN [13] |
| September 5 |
Teachers' Day (India) |
|
| September 6 |
Defense Day (Pakistan) |
|
| September 6 |
Colour Blindness Awareness Day[169] |
|
| September 7 |
Brazilian Independence Day |
|
| September 7 |
International Day of Clean Air for Blue Skies |
UN[170][171] |
| September 8 |
World Physical Therapy Day |
|
| September 8 |
International Literacy Day |
UN, UNESCO[13][172] |
| September 9 |
International Fetal Alcohol Spectrum Disorder (FASD) Awareness Day[173] |
NIH/International |
| September 9 |
International Day to Protect Education from Attack |
UN [174] |
| September 10 |
World Suicide Prevention Day |
UN, WHO[13][175] |
| September 11 |
Patriot Day |
|
| September 12 |
ATSEP Day |
Air traffic safety electronics personnel |
| September 13 |
RUOK? Day |
Depression awareness and suicide prevention (Australia)[176] |
| September 13 |
International Chocolate Day, Birthday of Milton S. Hershey.[177][178][179] |
|
| September 14 |
National Quiet Day (UK)[180] |
|
| September 14 |
Hindi Day |
|
| September 15 |
International Day of Democracy |
UN[13][181] |
| September 15 |
Engineer's Day (India) |
|
| September 16 |
International Day for the Preservation of the Ozone Layer |
UN[13][182] |
| September 16 |
Start of Mexican Independence Day |
|
| September 16 |
Malaysia Day |
|
| September 17 |
World Patient Safety Day |
WHO[183] |
| September 18 |
World Water Monitoring Day |
|
| September 19 |
International Talk Like a Pirate Day |
|
| September 20 |
International Day of University Sport |
FISU, UNESCO [184] |
| September 21 |
International Day of Peace |
UN[13][185] |
| September 22 |
Baltic Unity Day |
Seimas of Lithuania and Saeima of Latvia[186] |
| September 22 |
World Rhino Day[187] |
|
| September 22 |
Hobbit Day |
|
| September 22 |
World Car Free Day |
|
| September 23 |
International Day of Sign Languages |
UN[188][189] |
| September 23 |
Celebrate Bisexuality Day[190] |
Also known as Bisexual Pride or Bisexual Visibility Day |
| September 24 |
Heritage Day (South Africa) |
|
| September 25 |
World Pharmacists Day[191] |
International Pharmaceutical Federation |
| September 25 |
As You Wish Day |
|
| September 26 |
European Day of Languages |
|
| September 26 |
World Contraception Day[192] |
|
| September 27 |
World Tourism Day |
UN, UNWTO[13][193] |
| September 28 |
World Rabies Day |
UN, WHO[13][194] |
| September 28 |
International Right to Know Day[195] |
|
| September 28 |
International Safe Abortion Day[196] |
|
| September 28 |
Ask a Stupid Question Day |
|
| September 29 |
World Heart Day |
UN, WHO[13][197] |
| September 30 |
International Translation Day |
|
| September 30 |
Botswana Day |
|
