Abu Sa'id Dharir Gurgani (ابوسعید ضریر گرگانی), also Gurgani, was a 9th-century Persian^[1] mathematician and astronomer from Gurgan, Iran. He wrote a treatise on geometrical problems and another on the drawing of the meridian. George Sarton considers him a pupil of Ibn al-A'rabi, but Carl Brockelmann rejects this opinion.

Two of his works are extant:

• Masa'il Hindisia (a manuscript is available in Cairo)
• Istikhraj khat nisf al-nahar min kitab analima wa al-borhan alayh (available in Cairo, translated by Carl Schoy)

• List of Iranian scientists

• H. Suter. Mathematiker (12, 1900).

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