The Hank Zipzer: The World's Greatest Underachiever series of fictional American children's books (2003–2010) by actor Henry Winkler and writer Lin Oliver, tells the story of a dyslexic child, Hank Zipzer. The series is based on Winkler's difficulties with school as a child, and it is set in his childhood home. After finishing the main series, Winkler and Oliver created a prequel called Here's Hank. This series explores Hank's life as a second grader (2014 to 2019). In addition, Winkler and Oliver created a television series (and Christmas film) called Hank Zipzer that ran from January 2014 to December 2016 on the CBBC channel. HBO Max began streaming all three seasons of Hank Zipzer in May 2022 and Hank Zipzer's Christmas Catastrophe in December 2022.

Hank Zipzer is a young boy who is dyslexic. He lives on the Upper West Side of Manhattan with his family, and attends P.S. 87 at Amsterdam Avenue and W 78th Street. His best friends are Frankie Townsend and Ashley Wong.

Henry Winkler states that in 2003, he experienced "a lull in my acting career." Winkler's then-manager, Alan Berger suggested to Winkler that he should write children's books about the difficulties he experienced as a child before he knew that he was dyslexic. Winkler was resistant to the idea, which he initially thought "was insane," saying that he "couldn't do it." He finally agreed however, after Berger suggested that he co-write the books with an experienced author.

Berger introduced Winkler to his friend, children's book author Lin Oliver. Winkler and Oliver met for lunch, and discussed Winkler's childhood experiences. Oliver remembers thinking that, "here is this very articulate accomplished man, who suffered all through childhood because he wasn't good in school. It's a very moving story. So we created a character together who is smart, funny, resourceful, popular, who's got all the gifts - except that he is bad in school." Oliver and Winkler then developed the premise for a series about a dyslexic child, Hank Zipzer, who is based on Winkler (and every character in the series is also based on a real person in Winkler's life). In naming the character, Winkler chose "Hank" (which is short for Henry), and "Zipzer," which was the name of a neighbor in the apartment building that he grew up in.

Because they had both previously worked in television in multiple roles, they were used to collaborating and discussing ideas and working them out in a room together, which enabled their partnership. Winkler notes that this collaborative process is best reflected in the system they have developed that draws upon Oliver's strengths as a writer and Winkler's as an actor: Oliver types at the computer while Winkler talks. When Oliver has an idea, he waits while she types. When she reads it back to him, "we argue over every word, and then you say 'I have to get up, you drive me to drink.' And she gets a Snapple from the kitchen."

The series ran from 2003 to 2010, consisting of 17 volumes. After they finished it, Winkler and Oliver created a prequel series, Here's Hank (2012 to 2016) that explores Hank's life as a second grader, before he was diagnosed as dyslexic. The Here's Hank series also uses a special font called "dyslexie" (marking the first time that this font was used in book published in the United States).

Hank Zipzer is a British children's television series which stars Nick James in the titular role as a 12-year-old dyslexic schoolboy. Henry Winkler portrays Mr. Rock, Hank's music teacher, in the series. The first series premiered in January 2014 on the CBBC channel. Unlike the books that took place in Winkler's native United States, the series takes place in London, in the United Kingdom. The second series began airing on 13 August 2015. Javone Prince made his first appearance as Mr. Joy in season 2, episode 5, "Hank's Hero". The third series began airing on 26 May 2016, which was followed by an 84-minute Christmas movie released on 12 December 2016.

HBO Max began streaming all three seasons of Hank Zipzer in May 2022, and Hank Zipzer's Christmas Catastrophe in December 2022.