Chloë Grace Moretz Carrie White Julianne Moore Margaret White Gabriella Wilde Sue Snell Judy Greer Miss Desjardin Portia Doubleday Chris Hargensen Ansel Elgort Tommy Ross Alex Russell Billy Nolan Zoë Belkin Tina Blake Samantha Weinstein Heather Karissa Strain Nicki Watson Katie Strain Lizzy Watson Barry Shabaka Henley Principal Henry Morton Eddie Max Huband Harry Trenant Connor Price Freddy 'Beak' Holt Jefferson Brown Mr. Ulmann Cynthia Preston Eleanor Snell Philip Nozuka Ernie Peterson Kyle Mac Kenny Michelle Nolden Estelle Mouna Traoré Erika Chris Britton Dr. Dean L. McDuffy Chloë Grace Moretz Carrie White Julianne Moore Margaret White Gabriella Wilde Sue Snell Judy Greer Miss Desjardin Portia Doubleday Chris Hargensen Ansel Elgort Tommy Ross Alex Russell Billy Nolan Zoë Belkin Tina Blake Samantha Weinstein Heather Karissa Strain Nicki Watson Katie Strain Lizzy Watson Barry Shabaka Henley Principal Henry Morton Eddie Max Huband Harry Trenant Connor Price Freddy 'Beak' Holt Jefferson Brown Mr. Ulmann Cynthia Preston Eleanor Snell Philip Nozuka Ernie Peterson Kyle Mac Kenny Michelle Nolden Estelle Mouna Traoré Erika Chris Britton Dr. Dean L. McDuffy Derek McGrath Head Commissioner Max Topplin Jackie