Healthcare workers, teachers, civil servants and bus and train drivers are among those taking part in strikes with members of 16 unions involved.
There was a strong turnout of workers around the local picket lines, despite the bitterly cold weather.
Here are some of the scenes as workers join the Province-wide show of strength.

13. Strike action
Striking civil servants pictured at Marlborough House on Thursday morning. PT03-237. Photo: Tony Hendron

14. Strike action
Physiotherapists on picket line duty on Thursday morning at Craigavon Area Hospital. PT03-238. Photo: Tony Hendron

15. Strike action
Craigavon Area Hospital nurses who joined the mass picket on Thursday morning. PT03-239. Photo: Tony Hendron

16. Strike action
Striking staff on picket duty at Craigavon Area Hospital on Thursday morning. PT03-241. Photo: Tony Hendron