Dong may refer to any of the following:

1. Dong (currency), the currency unit of Vietnam (đồng, ₫). 1 dong = 100 xu .
2. (Colloq.) Penis or dildo - see: Long Dong Silver, a pornographic actor world famous for the enormous size of his penis.
3. Creature in the nonsense poetry of Edward Lear, The Dong with a Luminous Nose
4. Dong people (侗族), an ethnic minority group in the Guangxi and Guizhou provinces of south-west China
5. Transliteration of Chinese family names 董,東 (in Mandarin pinyin) and 黨 (in Cantonese). The same names can be spelled as Tung in other systems of transliteration. See also Dong Biwu, Dong Xi, Dong Yuan, Dong Zhuo, Tung Chee-hwa, Tung Chao Yung et al.
6. Onomatopoeic term to refer to the (especially low) sound of a bell.
7. Long Duk Dong or "the Donger," a character in the 1984 American movie Sixteen Candles.
8. Dansk Olie og Naturgas, Denmarks's state-owned oil and gas company.