U+5F20 CJK Unified Ideo­graph-​5F20

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Zhang ([ʈʂáŋ] ) is the third most common surname in China and Taiwan (commonly spelled as "Chang" in Taiwan), and it is one of the most common surnames in the world. Zhang is the pinyin romanization of the very common Chinese surname written 张 in simplified characters and 張 in traditional characters. It is spoken in the first tone: Zhāng. It is a surname that exists in many languages and cultures, corresponding to the surname 'Archer' in English for example. In the Wade-Giles system of romanization, it is romanized as "Chang", which is commonly used in Taiwan; "Cheung" is commonly used in Hong Kong as a romanization.

It is also the pinyin romanization of the less-common surnames 章 (Zhāng), which is the 40th name on the Hundred Family Surnames poem. There is the even-less common 仉 (Zhǎng).

張 was listed 24th in the famous Song-era Hundred Family Surnames, contained in the verse 何呂施張 (He Lü Shi Zhang).

Today, it is one of the most common surnames in the world at over 100 million people worldwide.

張 was listed by the People's Republic of China's National Citizen ID Information System as the third-most-common surname in mainland China in April 2007, with 87.50 million bearers.

A commonly cited but erroneous factoid in the 1990 Guinness Book of Records listed it as the world's most common surname, but no comprehensive information from China was available at the time and more recent editions have not repeated the claim.