The actress will appear in several episodes of the CBS show when it returns later this year, TV Line reports.
Raymund is expected to play a police officer called Leah Sosa, who is described as "accomplished".
She is asked to work with Jamie (Will Estes) when his current partner Renzulli (Nick Turturro) is promoted to fill in as platoon commander. It soon emerges that Leah and Jamie knew each other at the Academy.
Raymund is probably best known for her role as Ria Torres in Lie To Me, which was cancelled by Fox after three seasons earlier this year.
David Ramsay has also signed up to appear in the new season of Blue Bloods, while CBS recently announced that Carrie Underwood and Tony Bennett will perform in the season premiere.
Blue Bloods will return for its second season on September 23 on CBS.