- American History Month
- Black History Month
- Canadian History Month
- Human Relations Month
- Developmental Disabilities Awareness Month
- Greek-American Heritage Month
- Gender Equality Month
- Irish-American Heritage Month
- Ethnic Equality Month
- National Women's History Month
- 8th International Women's Day
- 8th United Nations Day for Women's Rights and International Peace
- 11th World Day of Muslim Culture, Peace, Dialogue and Film
- 25th International Day of Remembrance of the Victims of Slavery and the Transatlantic Slave Trade
- Community Service Month
- Earth Month
- Autism Awareness Month
- Arab-American Heritage Month
- Tartan (Scottish-American) Heritage Month
- Celebrate Diversity Month
- National Asian American and Pacific Islander Heritage Month
- Haitian Heritage Month
- Indian Heritage Month
- Jewish-American Heritage Month
- Mental Health Month
- South Asian Heritage Month
- Personal History Awareness Month
- Speech and Hearing Awareness Month
- Older Americans Month
- National Caribbean American Heritage Month
- LGBT Pride Month
- Black Music Month
- National Civility Month
- 9/15–10/15 Hispanic Heritage Month
- National Guide Dog Month
- Bullying Prevention Month
- Domestic Violence Awareness Month
- AIDS Awareness Month
- Down Syndrome Awareness Month
- Family History Month
- Filipino-American Heritage Month
- Hate Crime Awareness Month
- Italian-American Heritage Month
- LGBT History Month
- National Disability Employment Awareness Month
- National German Heritage Month (Sept. 15–Oct. 15)
- National Work and Family Month
- 7th - Ageism Awareness Day
- National Native American Heritage Month
- National American Indian & Alaska Native Heritage Month
- Universal Human Rights Month