Kosho Uchiyama (内山 興正 Uchiyama Kōshō?, 1912—March 13, 1998) was a Sōtō priest, origami master, and abbot of Antai-ji near Kyoto, Japan.

Uchiyama was author of more than twenty books on Zen Buddhism and origami,of which Opening the Hand of Thought: Foundations of Zen Buddhist Practice is best known.

Uchiyama graduated from Waseda University with a masters degree in Western philosophy in 1937 and was ordained a priest in 1941 by his teacher Kodo Sawaki.Throughout his life, Uchiyama lived with the damaging effects of tuberculosis.
Uchiyama became abbot of Antai-ji following Sawaki's death in 1965 until he retired in 1975 to Nokei-in, also near Kyoto, where he lived with his wife. Following the death of his teacher he led a forty-nine day sesshin in memorial of his teacher. In retirement he continued his writing, the majority of which consisted of poetry.