Day Date Month Holiday
Sunday 01 Jan New Year's Day
Thursday 13 Apr Maundy Thursday
Friday 14 Apr Good Friday
Sunday 16 Apr Easter Sunday
Monday 17 Apr Easter Monday
Thursday 20 Apr First Day of Summer
Monday 01 May Labour Day
Thursday 25 May Ascension Day
Sunday 04 Jun Whit Sunday
Monday 05 Jun Whit Monday
Saturday 17 Jun Icelandic Republic Day
Monday 07 Aug Bank Holiday
Sunday 24 Dec Christmas Eve (from noon)
Monday 25 Dec Christmas Day
Tuesday 26 Dec Second Day of Christmas
Sunday 31 Dec New Year's Eve (from noon)
Source: https://www.timeanddate.com/holidays/iceland/2017#!hol=9