The company, which has its international headquarters in the town, supplies products to 19 countries outside of North America.
This expansion will bring the company’s workforce to 459 by the end of 2017.
The announcement is being made this morning by Taoiseach Enda Kenny at the company’s offices in Dundalk.
The new jobs have the support of the Department of Jobs, through IDA Ireland.
“National Pen are a key export orientated company and announcements like this are a significant signal of Ireland’s strengths as a location for investment – our people, our pro-business policies and our proximity to European markets.”