Ogasawara Nagatsune (小笠原 長経, May 17, 1179 – November 5, 1247) in the province of Shinano. He was the eldest son of Ogasawara Nagakiyo and the rightful inheritor of the art of Ogasawara-ryu archery and mounted archery.
His wife was a daughter of Takeda Tomonobu. Some of his children were Ogasawara Nagafusa, Akazawa Kiyotsune, Tamura Nagazane, Ueno Morinaga, and Akazato Nagamura among others.
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