Ireland - who played terrorist Aileen Morgan on Homeland - has landed a potentially recurring role on Bacon's 2013 thriller series, according to The Hollywood Reporter.
Her character Amanda - described as "fragile" and "simple-minded" - will first appear in The Following's ninth episode and may reappear in following instalments.
Ireland's past credits include TV roles on recently-axed Starz series Boss and AMC's The Killing and film appearances in 2007's I Am Legend and 2008's Rachel Getting Married.
The Following - created by Scream's Kevin Williamson - focuses on maverick FBI agent Ryan Hardy (Kevin Bacon) and his feud with serial killer nemesis Joe Carroll (James Purefoy).
The series also stars Shawn Ashmore (X-Men), Natalie Zea (Justified), Mike Colter (Ringer) and Warren Kole (Common Law).
The Following will air on Sky Atlantic in the UK and premieres on Fox in the US on Monday, January 21 at 9/8c.
> Homeland star Marin Ireland lands lead in AMC drama
> Person of Interest star Susan Misner joins The Following
Watch a trailer for The Following below: