October
- 2 October: Republic of Ireland, Treaty of Lisbon referendum
- 4 October: Greece, Parliament
- 16 October: Botswana, Parliament
- 20 October: Niger, Parliament
- 25 October: Tunisia, President and Parliament
- 25 October: Uruguay, President (1st Round), Parliament and Referendum
- 26 October: Marshall Islands, President (indirect)
- 28 October: Mozambique, President and Parliament
Read more about this topic: 2009 Elections