Johan Michael Keyser (15 January 1749–1 December 1810) was a Norwegian theologian and priest.

Growing up, he was taught by the priest Peder Hesselberg, one first of the Herrnhutterne in Norway.

In 1777, he received the recommendation of the Bishop Christen Schmidt to become the resident chaplain in the parish of Ullensaker.

[1] The Danish historian D. Thrap said of him: He was a gentle, meek, pervasive personality who won the hearts of people everywhere.

The simple man understood him, and the learned people did not feel bored by hearing him.