Tuesday 01 Jan New Year's Day
Monday 18 Mar Ash Monday
Monday 25 Mar National Holiday
Friday 29 Mar Good Friday (Catholic)
Monday 01 Apr Easter Monday (Catholic)
Wednesday 01 May Labour Day
Friday 03 May Good Friday
Monday 06 May Easter Monday
Tuesday 07 May Transfer of Labour Day Holiday
Monday 24 Jun Whit Monday
Thursday 15 Aug Assumption Day
Monday 28 Oct National Holiday
Tuesday 24 Dec Christmas Eve
Wednesday 25 Dec Christmas Day
Thursday 26 Dec Second Day of Christmas
Tuesday 31 Dec New Year's Eve (Half holiday)
Source: http://www.ase.gr/content/en/ann.asp?AnnID=55002