Peter Aron van Pels (November 8, 1926 – c. May 5, 1945), was a German Jewish refugee who hid with Anne Frank and seven other people in the Secret Annex on the Prinsengracht, Amsterdam, during the Nazi Occupation of the Netherlands, and who died in the Mauthausen concentration camp, Austria. In the published version of Anne Frank's diary he was given the pseudonym Peter van Daan.
After several failed attempts to emigrate, the van Pels family joined the Franks in their hiding place in concealed rooms at the rear of Otto Frank's office building on 13 July 1942.
Although he was already acquainted with Anne Frank, neither ever relished the prospect of living with each other. When he joined the Franks in hiding, Peter was sixteen, and Anne Frank was thirteen. Her diary recounts how her initial feelings of dislike for the shy and awkward boy changed as she learned more about him and his feelings. Eventually they started a romance. She received her first kiss from him, but her infatuation with him began to wane as she questioned whether her feelings for him were genuine, or resulted from their shared confinement.