Actors of fully Jewish background: Logan Lerman, Natalie Portman, Joseph Gordon-Levitt, Mila Kunis, Bar Refaeli, James Wolk, Anton Yelchin, Paul Rudd, Jennifer Jason Leigh, Emmanuelle Chriqui, Julian Morris, Adam Brody, Kat Dennings, Gabriel Macht, Sarah Michelle Gellar, Erin Heatherton, Lisa Kudrow, Lizzy Caplan, Gal Gadot, Debra Messing, Jason Isaacs, Jon Bernthal, Robert Kazinsky, Melanie Laurent, Esti Ginzburg, Shiri Appleby, Justin Bartha, Margarita Levieva, Elizabeth Berkley, Halston Sage, Seth Gabel, Corey Stoll, Mia Kirshner, Alden Ehrenreich, Debra Winger, Eric Balfour, Emory Cohen, Scott Mechlowicz, Odeya Rush, William Shatner, Leonard Nimoy.
Andrew Garfield and Aaron Taylor-Johnson are Jewish, too (though I don’t know if both of their parents are).
Actors with Jewish mothers and non-Jewish fathers: Jake Gyllenhaal, Dave Franco, James Franco, Scarlett Johansson, Daniel Day-Lewis, Daniel Radcliffe, Alison Brie, Eva Green, Joaquin Phoenix, River Phoenix, Emmy Rossum, Ryan Potter, Rashida Jones, Jennifer Connelly, Sofia Black D’Elia, Nora Arnezeder, Goldie Hawn, Ginnifer Goodwin, Amanda Peet, Eric Dane, Jeremy Jordan, Joel Kinnaman, Ben Barnes, Patricia Arquette, Kyra Sedgwick, Dave Annable, and Harrison Ford (whose maternal grandparents were both Jewish, despite those Hanukkah Song lyrics).
Actors with Jewish fathers and non-Jewish mothers, who themselves were either raised as Jews and/or identify as Jews: Ezra Miller, Gwyneth Paltrow, Alexa Davalos, Nat Wolff, Nicola Peltz, James Maslow, Josh Bowman, Winona Ryder, Michael Douglas, Ben Foster, Jamie Lee Curtis, Nikki Reed, Zac Efron, Jonathan Keltz, Paul Newman.
Oh, and Ansel Elgort’s father is Jewish, though I don’t know how Ansel was raised. Robert Downey, Jr. and Sean Penn were also born to Jewish fathers and non-Jewish mothers. Armie Hammer and Chris Pine are part Jewish.
Actors with one Jewish-born parent and one parent who converted to Judaism: Dianna Agron, Sara Paxton (whose father converted, not her mother), Alicia Silverstone, Jamie-Lynn Sigler.