Shailene Woodley as Hazel Grace Lancaster

Ansel Elgort as Augustus Waters

Nat Wolff as Isaac

Laura Dern as Frannie Lancaster

Sam Trammell as Michael Lancaster

Willem Dafoe as Peter van Houten

Lotte Verbeek as Lidewij Vliegenthart

Ana Dela Cruz as Dr. Maria

Randy Kovitz as Dr. Simmons

Toni Saladna as Flight Attendant

David Whalen as Gus' Dad

Milica Govich as Gus' Mom

Allegra Carpenter as Hostess

Emily Peachey as Monica

Emily Bach as Monica's Mom

Tim Hartman as Minister

Mike Birbiglia as Patrick

Bethany Leo as Speaker #1 (Beth)

Alexis Hodges as Speaker #2 (Angel)

Jean Brassard as Waiter

Carly Otte as Young Girl (Alisa)

Lily Kenna as Young Hazel

Silvio Wolf Busch as European

Viviana Cardenas as Support Group Member (Julie)

Jordan Drexel as Speaker #3 (Sid)

P.J. Rosotto as Speaker #4 (PJ)

Tanner Boatwright as Gus's Leg Double

Cheyenne Hurley as Coffee Shop Worker

Jennifer Kline as Giggling Girl

Carol Weyers as Anne Frank (voice)

Lauren Blumenthal as Support Group

Nikki Lipinski as Support Group

Sebastian Dean as Support Group

Alexander Murph as Support Group

Taylor Dettore as Support Group

Josh Potter as Support Group

Steven Edmonds as Support Group

Cindy Zeng as Support Group

C.J. Evans as Support Group

John Green as Little Girl's Father (uncredited)