Tāngyīn is a county-level administrative division in northern Henan Province, China. Its name literally means 'the shady (north) side of the Tāng River' — a common pattern in Chinese toponymy where 'yīn' refers to the north bank of a river (the side sheltered from the sun), and 'Tāng' is the historical name of the local river, unrelated to the word for 'soup' (tāng) despite identical spelling.

Founded over 3,000 years ago, Tāngyīn is culturally significant as the birthplace of the famous Song Dynasty general Yue Fei and home to the historic Yue Fei Temple. It is also known for its well-preserved ancient city walls and traditional architecture. As a proper noun, Tāngyīn is always capitalized in pinyin and used without classifiers or measure words when referring to the place itself — e.g., 'in Tāngyīn County' rather than 'a Tāngyīn'.