Friday 06 Jan Epiphany
Monday 27 Feb Ash Monday
Friday 06 Apr Good Friday (Catholic)
Monday 09 Apr Easter Monday (Catholic)
Friday 13 Apr Good Friday (Orthodox)
Monday 16 Apr Easter Monday (Orthodox)
Tuesday 01 May Labour Day
Monday 04 Jun Whit Monday
Wednesday 15 Aug Assumption Day
Monday 24 Dec Christmas Eve
Tuesday 25 Dec Christmas Day
Wednesday 26 Dec Second Day of Christmas
Monday 31 Dec New Year's Eve (Half holiday)
Source: http://www.ase.gr/content/en/ann.asp?AnnID=55002