Henry Winkler was born on October 30, 1945, on the West Side of Manhattan, New York, the son of homemaker Ilse Anna Marie (1913–2002) and lumber company president Harry Irving Winkler (1903–1995). His parents were German Jews who emigrated from Berlin to the U.S. in 1939, on the eve of World War II. Winkler said that his parents came to the U.S. for a six-month business trip but knew they were never going back. His father smuggled the only assets the family had left (family jewels disguised as a box of chocolates) that he carried under his arm. Although they did not keep kosher, Winkler was raised in the traditions of Conservative Judaism, but said that he was not religious as an adult. The family attended Congregation Habonim, where his mother ran the Judaica shop. His parents were founding members of the temple. Winkler has a sister named Beatrice. Winkler has said that he was very anxious as a child because of his undiagnosed dyslexia and that he was considered to be "slow, stupid, not living up to my potential." As his father spoke 11 languages and could do math in his head, he did not understand Winkler's problems at school and why Winkler would celebrate a C grade. He also said that his relationship with his parents was strained, due at least partially to their attitude towards his undiagnosed dyslexia. His father referred to him as "dumb dog" and often punished him for his difficulties in school. Winkler attended P.S. 87 on W. 78th Street which remains in operation today, and then graduated from McBurney School in 1963 which was located in Manhattan's Upper West Side neighborhood.

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