William Campbell (Chinese: 甘為霖; Pe̍h-ōe-jī: Kam Ûi-lîm) (1841–1921) was a Scottish Presbyterian missionary to Formosa (Qing Taiwan).

[3] Interested in the early history of the island (particularly the Dutch era), his knowledge of the time was such that he was called "without doubt the greatest authority on this subject living".

[6] He was a contemporary of Thomas Barclay, James Laidlaw Maxwell and George Leslie Mackay, who were all engaged in missionary work in Taiwan.

A strong supporter of "native ministers" (i.e. Han and aborigine clergy), Campbell wrote concerning one particular incident that ...our worthy Chinese colleague received a most hearty welcome from the brethren.

Men like Pastor Iap are able to adapt themselves in a way the missionary can never do, and to overcome difficulties which must always hamper any mere sojourner in the country.