List of Legal Holidays to be Observed by the Bank of Thailand and Financial Institutions in Thailand During the Year 2011
Monday 3 Jan Substitution New Year's Day (Saturday 1 January)
Friday 18 Feb Makha Bucha Day
Wednesday 6 Apr Chakri Day
Wednesday 13 Apr Songkran Festival
Thursday 14 Apr Songkran Festival
Friday 15 Apr Songkran Festival
Monday 2 May Substitution for National Labour Day (Sunday 1 May)
Thursday 5 May Coronation Day
Friday 13 May Ploughing Ceremony Day (Government only)
Monday 16 May Special Holiday
Tuesday 17 May Wisakha Bucha Day
Friday 1 Jul Mid Year Closing Day (Bank only)
Friday 15 Jul Asarnha Bucha Day
Friday 12 Aug H.M. the Queen's Birthday
Monday 24 Oct Substitution for Chulalongkorn Day (Sunday 23 October)
Monday 5 Dec H.M. the King's Birthday
Monday 12 Dec Substitution for Constitution Day (Saturday 10 December)
For financial institutions in Narathiwat, Pattani, Yala, and Satun, an extra holiday is given for the Eidilfitri Day (Ramadan Day) announced by the Sheikhul Islam Office if it does not fall on any of the holidays listed above or Saturday and Sunday.
Source: http://www.bot.or.th/English/FinancialInstitutions/FIholiday/Pages/2554.aspx