Horrible Harry is a book series by Suzy Kline for young kids about the adventures of a typical second-grader named Harry who likes gross things and causing trouble. The books also follow the antics of Harry's fellow second-graders, including his best friend, Doug; his crush, Song Lee; his arch-rival, Sidney, and their teacher, Miss Mackle.

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If you were looking for the other Harry that has a scar and glasses, go here.

• Arch Enemies: Sidney and Harry.
• Blondes Are Evil: Mary.
• Book Dumb: Harry.
• Cool Teacher Cool Principal: Mr. Cardini. He let Doug spike his hair.
• Crowning Moment of Awesome: The climax of Song Lee and the "I Hate You" Notes. Beware the Nice Ones indeed.
• Crowning Moment of Funny: Sidney making a canary out of Tinker Toys in Horrible Harry and the Green Slime (see In Series Nickname below).
• Fan Boy: Dexter's main shtick is being an Elvis fanboy.
• Feud Episode: Three times.
• Follow the Leader: This series takes several cues from Ramona Quimby and The Magic School Bus.
• Girlish Pigtails: Mary.
• Hair Color Dissonance: Is Harry's hair black or dark red?
• Hair of Gold: Doug and Miss Mackle.
• Heroic BSOD: Harry gets one in Horrible Harry and the Holidaze after his great-grandfather has to be sent to a nursing home because of a stroke.
• Heterosexual Life Partners: Doug and Harry; Mary and Ida.
• In-Series Nickname: Harry and Sidney constantly refer to each other as "Sid the Squid" and "Harry the Canary."
• Jerkass: Sidney, Harry and Mary all have their moments, but Sidney takes it a step too far in Horrible Harry and the Ant Invasion when he kills a fish in the class fish tank so he can frame Harry.
• Evil Jerk Ass Redhead: Sidney.
• Limited Wardrobe
• New Year, Same Class
• No (Full) Name Given: Averted. Everyone's last name is mentioned at some point; Harry (Spooger), Doug (Hurtuk), Song Lee (Park), Sidney (La Fleur), Dexter (Sanchez), Mary (Berg), Ida (Burrell), and Yousef "ZuZu" (Hadad).
• Not So Different: Sidney and Harry.
• Our Dragons Are Different: In Horrible Harry and the Dragon War, Harry and Song Lee get into an argument about Asian and European dragons.
• Sassy Black Woman: Ida is an aversion. (Well, she's only seven or eight years old, so yeah.)
• Shown Their Work: All of the depictions of winter holidays from around the world in Horrible Harry and the Holidaze are certified 100% accurate.
• Tear Jerker: In-universe - when Miss Mackle is reading the part of Charlotte's Web where dies, Harry and Song Lee cry.
• Token Minority: Averted, hard. There's Song Lee (who's Korean), Mary (who is Jewish), ZuZu (who's Lebanese), Ida (who's black), Dexter (who is Hispanic or Latin-American) and possibly Sidney (who's probably French because his last name is La Fleur).
• Toy Ship: Harry and Song Lee — one book even saw them getting (fake) married.
• Why Did It have To Be Elevators: Harry is terrified of elevators because of an incident in a department store (IIRC) that happened when he was three.
• Yamato Nadeshiko: Song Lee, although she's Korean, not Japanese.