Rifkin will appear in the NBC drama's 13th season premiere, according to TV Guide.
Die Hard 2 actor Franco Nero will also feature in the episode as an Italian dignitary who is accused of rape.
It has now been confirmed that Brothers & Sisters star Rifkin will play the defence attorney of Nero's character.
Rifkin previously played Arvin Sloane on Alias from 2001 to 2006 and has also appeared in such films as 1998's The Negotiator, 2001's The Majestic and 2002's The Sum of All Fears.
TR Knight, Mehcad Brooks, Kyle MacLachlan and Paige Turco will all appear in the new season of Law & Order: SVU, while Linus Roache will reprise his Law & Order role of ADA Michael Cutter on the show.
Law & Order: SVU returns to NBC on Wednesday, September 21 at 10/9c.
> Law & Order: SVU to 'explore Stabler exit'