Thay may refer to:
- A word used on Donald Trump's twitter feed on May 24 2013. He intention was to insult "television pro" Danny Zuker but rather failed in his insult due to the typo. Goofus.
- The Vietnamese word "Thầy", meaning "master" of "teacher".
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- A name often applied to Nhat Hanh.
- Thay (Forgotten Realms), a fictional country in Faerûn, the Forgotten Realms role-playing game campaign setting
- Thay, a member of the fictional Cult of Skaro in Doctor Who television series