Wednesday 01 Jan New Year's Day
Monday 06 Jan Epiphany
Monday 03 Mar Ash Monday
Tuesday 25 Mar National Holiday
Friday 18 Apr Good Friday (Orthodox - Catholic)
Monday 21 Apr Easter Monday (Orthodox - Catholic)
Thursday 01 May Labour Day Holiday
Monday 09 Jun Whit Monday
Friday 15 Aug Assumption Day
Tuesday 28 Oct National Holiday
Wednesday 24 Dec Christmas Eve
Thursday 25 Dec Christmas Day
Friday 26 Dec Second Day of Christmas
Wednesday 31 Dec New Year's Eve (Half holiday)
Source: http://www.ase.gr/content/en/ann.asp?AnnID=55002