Mirza Mohammad Reza Kalhor
Born	c. 1829 Iran
Died	1892 Tehran, Iran
Resting place	Ḥasanābād cemetery
Known for	Calligraphy
Style	Nastaʿlīq script technique
Children	9

Mirza Reza Kalhor (Persian: محمدرضا کلهر; c. 1829 – 1892) was a 19th-century Iranian calligrapher, known for his mastery of the Nastaʿlīq script technique.^[1]

A member of the Kurdish Kalhor tribe of Kermanshah, he initially followed the typical tribal path, learning horsemanship and sharpshooting. He gained an interest in calligraphy as a child, and left the tribe for further training.^[1] During his career, he introduced several innovations to Nastaʿlīq calligraphy, changing both the aesthetics and mechanics of the technique.^[1]

Kalhor modified and adapted Nastaʿlīq to be easily used with printing machines and newspaper lithography, which in turn helped wide dissemination of his transcripts.^[1][2] He also devised methods for teaching Nastaʿlīq and specified clear proportional rules for it, which many could follow.^[1]

He died of cholera in Tehran at age 65, having sired nine children and taught many calligraphy students, several of whom went on to become notable in their own right.^[1] He was buried in Ḥasanābād cemetery.^[1]