Weng may refer to:
Weng (Chinese: 翁; pinyin: Wēng), is a Chinese family name that ranked 200th place in the Hundred Family Surnames. It is usually romanised as Yung in Cantonese (commonly used in Hong Kong) and as Iong in Cantonese (commonly used in Macau).
Weng is a municipality in the district of Landshut in Bavaria in Germany.