Henrik Harpestræng (died 2 April 1244) was a Danish botanical and medical author.
His greatest work was an urtebog (book of herbs), written in Danish.
The main body of text is probably translations from two Latin works, De Viribus Herbarum by a person who calls himself Aemilius Macer, but is rather Odo Magdunensis, and De gradibus liber by Constantinus Africanus.
However, there are a good many sections of which Henrik Harpestræng is undoubtedly the original author.
Henrik Harpestræng was probably also the Henricus Dacus or Henricus de Dacia who authored a Latin essay on plants, Liber de simplicibus medicinis laxativis, and to the Maistre Henry de Danemarche, of 1181, whom a manuscript in the National Library in Paris designates as "excellent medecin à Orleans et grant astrologicien".