Eng, agma, or engma (capital: Ŋ, lowercase: ŋ) is a letter of the Latin alphabet, used to represent a voiced velar nasal (as in English singing) in the written form of some languages and in the International Phonetic Alphabet.

The First Grammatical Treatise, a 12th-century work on the phonology of the Old Icelandic language, uses a single grapheme for the eng sound, shaped like a g with a stroke ⟨ǥ⟩.

Early printers, lacking a specific glyph for eng, sometimes approximated it by rotating a capital G, or by substituting a Greek letter η (eta) before modified to present form ⟨ŋ⟩ for it (encoded in Unicode as the Latin letter n with long leg: Ƞ ƞ).

In British English, n is pronounced eng in the prefixes en- and in- when they are followed by c, g and q, as in encroachment, engagement, enquiry, incursion, ingredient, inquiry and others.

In African languages such as Bemba, ng' (with an apostrophe) is widely used as a substitute in media where eng is hard to reproduce.