Trey is a given name, as well as a nickname for people with the name suffix III. Notable people with the name include:
- Trey Adams (born 1997), American football player
- Trey Alexander (born 1983), American soccer player
- Trey Alexander (basketball) (born 2003), American basketball player
- Trey Amos (born 2002), American football player
- Trey Anastasio (born 1964), American musician
- Trey Anthony (born 1974), Canadian comedian and playwright
- Trey Augustine (born 2005), American ice hockey player
- Trey Ball (born 1994), American baseball player
- Trey Beamon (born 1974), American baseball player
- Trey Brewer, American bodybuilder
- Trey Bruce, American songwriter
- Trey Burke (born 1992), American basketball player
- Trey Cabbage (born 1997), American baseball player
- Trey Dean (born 2000), American football player
- Trey Ellis (born 1962), American novelist
- Trey Flowers (born 1993), American football player
- Trey Galloway (born 2001), American basketball player
- Trey Gowdy (born 1964), American politician
- Trey Grayson (born 1972), American politician
- Trey Griffey (born 1994), American football player
- Trey Gunn (born 1960), American musician
- Trey Hardee (born 1984), American decathlete
- Trey Hendrickson (born 1994), American football player
- Trey Hill (born 2000), American football player
- Trey Hillman (born 1963), American baseball manager
- Trey Hodges (born 1978), American baseball player
- Trey Hutchens (born 1998), American race car driver
- Trey Johnson (born 1984), American basketball player
- Trey Junkin (born 1961), American football player
- Trey Kaufman-Renn (born 2002), American basketball player
- Trey Knox (born 2001), American football player
- Trey Lance (born 2000), American football player
- Trey Lewis (disambiguation), multiple people
- Trey Lorenz (born 1969), American singer and songwriter
- Trey Lyles (born 1995), Canadian basketball player
- Trey Marshall (born 1996), American football player
- Trey McBride (born 1999), American football player
- Trey Moore (born 1972), American baseball player
- Trey Palmer (born 2001), American football player
- Trey Parker (born 1969), American actor and comedian
- Trey Pipkins (born 1996), American football player
- Trey Quinn (born 1995), American football player
- Trey Radel (born 1976), American politician
- Trey Ragas (born 1996), American football player
- Trey Rucker (born 2001), American football player
- Trey Sermon (born 1999), American football player
- Trey Smith (disambiguation), multiple people
- Trey Spruance (born 1969), American composer
- Trey Steimel, American politician
- Trey Taylor (born 2001), American football player
- Trey Teague (born 1974), American football player
- Trey Thompkins (born 1990), American basketball player
- Trey Townsend (born 2002), American basketball player
- Trey Waltke (born 1955), American tennis player
- Trey White (born 2004), American football player
- Trey Wingo (born 1963), American sportscaster
- Trey Williams (born 1992), American football player
- Trey Wolfe (born 1988), American football player
- Trey Wolff (born 2000), American football placekicker
- Trey Yesavage (born 2003), American baseball player
- Trey Yingst (born 1993), American reporter
- Trey Azagthoth, guitarist for death metal band Morbid Angel
- Trey Songz (born 1984), American R&B singer, songwriter, record producer, rapper, and actor Tremaine "Trey" Neverson
- MC Trey, also known as Trey, Fijian-Australian vocalist, and hip-hop activist