| 角色 | 饰演者 | 角色介绍 |
| Greg Heffley | 扎克瑞·戈登 | |
| Rowley Jefferson | 罗伯特·卡普荣 | |
| Susan Heffley | 拉琪儿·哈里斯 | |
| Frank Heffley | 史蒂夫·茨恩 | |
| Manny Heffley | Connor Fielding | |
| Manny Heffley | Owen Fielding | |
| Rodrick Heffley | 戴文·博斯蒂克 | |
| Angie Steadman (as Chlo? Grace Moretz) | 科洛·莫瑞兹 | |
| Chirag Gupta | Karan Brar | |
| Fregley | 格雷森·拉塞尔 | |
| Patty Ferrell | 莱恩·麦克尼尔 | |
| Collin | 阿莱克斯·费瑞斯 | |
| Coach Malone | 安德鲁·麦克尼 | |
| Mrs. Norton | Belita Moreno | |
| Mr. Winsky | Rob LaBelle | |
| Pete Hosey | Nicholas Carey | |
| Carter | Samuel Patrick Chu | |
| Wade | Donnie MacNeil | |
| Marley | Ava Hughes | |
| Darren Walsh | Harrison Houde | |
| Dieter Muller | Severin Korfer | |
| Mrs. Flint | Jennifer Clement | |
| Mrs. Irvine | Karin Konoval | |
| Vice Principal Roy | Raugi Yu | |
| Rowley's Mom | Kaye Capron | |
| Archie Kelly | Jake D. Smith | |
| Arthur | Talon Dunbar | |
| Bryce Anderson | Owen Best | |
| Cheese Girl | Naomi Dane | |
| Cheese Boy | Willem Jacobson | |
| Coach Brewer | Sean Bygrave | |
| Elderly Woman | Maxine Miller | |
| Granddaughter | Taya Clyne | |
| Grown-Up Greg | Nathaniel Marten | |
| Preston | Rylee Stiles | |
| Lunch Girl #1 | Nikki Frazer | |
| Lunch Kid #2 (as Greta Gibson) | Greta Makena Gibson | |
| Grown-Up Quentin | Peter New |
