Dingbian County (simplified Chinese: 定边县; traditional Chinese: 定邊縣; pinyin: Dìngbiān Xiàn) is a county in the northwest of Shaanxi province, China, bordering the Ningxia Hui Autonomous Region to the west and Inner Mongolia to the north.

It is the westernmost county-level division under the administration of Yulin City.

As of 2020, Dingbian County is divided to 1 subdistrict, 16 towns, and 2 townships.

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