NYM or Nym may refer to:

• New York Mets, a professional baseball team
• New York Magic, an American women’s soccer team
• New York Methodist Hospital, hospital located in Brooklyn, New York
• IATA code for Nadym Airport
• Pseudonym, especially in the context of Internet pseudonyms
• Nym server, a pseudonym server which provides untraceable email addresses
• Nym, an alien character in Star Wars
• The Nym, a race of artificial humanoid sentient plants from the Age of Legends in The Wheel of Time fantasy book series
• Nym, a corporal in Shakespeare's play Henry V and a minor figure in Shakespeare's play The Merry Wives of Windsor
• Nym, a character from the Forgotten Realms setting of Dungeons & Dragons
• Nym, *-onym, an English affix

The suffix -onym, in English and other languages, means "word, name," and words ending in -onym refer to a specified kind of name or word, most of which are classical compounds. For example, an acronym is a word formed from the initial letter or letters of each of the successive parts or major parts of a compound term (as radar). The use of -onym words provides a means of classifying, often to a fine degree of resolution, sets of nouns with common attributes.