Jaap ter Haar (25 March 1922 – 26 February 1998) was a prolific Dutch author of children's literature.

[2] In addition to his day job, ter Haar made many radio plays for broadcaster NCRV featuring stories of the characters Saskia and Jeroen.

[2] When Radio Netherlands Worldwide no longer permitted employees to earn income outside of work, Ter Haar decided to become a full-time writer in 1952.

[2] He won the Gouden Griffel award for his book Het wereldje van Beer Ligthart.

[2] In 1976 he won the Buxtehude Bull for the book Behalt das Leben lieb, the German translation of Het wereldje van Beer Ligthart by Hans-Joachim Schädlich.