Aldo Zelnick are a comic novel children's book series intended for middle-grade students, written by Karla Oceanak and illustrated by Kendra Spanjer. These books have titles written in alphabetical order and follow the life of a ten-year-old boy, Aldo, and are written and illustrated as entries in Aldo's sketchbook. The books contain handwritten-looking text mixed with black-and-white cartoon illustrations. Each book also focuses on vocabulary building for each different letter of the alphabet.