| September 1 | Brunei/Indonesia/Malaysia | Ramadhan Begins | |
| September | Singapore | Annual Dialogue with ASEAN Economic Ministers. | Martin Hutagalung US-ASEAN Business Council Singapore Tel: 65.6339.8885 Fax: 65.6339.1982 mhutagalung@usasean.org |
| September 2 | Vietnam | National Day | |
| September 3-5 | Philippines | Philippine Business Mission | Marc Mealy US-ASEAN Business Council Washington, DC Tel: 202.416.6707 Fax: 202.289.0519 mmealy@usasean.org |
| September 17-19 | New York | United Nations General Assembly Meetings. tbd | Cheryle Davis US-ASEAN Business Council Washington, DC Tel: 202.416.6715 Fax: 202.289.0519 cdavis@usasean.org |
| September 24 | Cambodia | Constitution's Day | |
| September 28-30 | Cambodia | Pchum Ben Day | |
| September 29 | Indonesia | Joint Day Off | |
| September 30 | Indonesia | Joint Day Off |