Gabby may refer to:
- Gabriel Agbonlahor (born 1986), British footballer
- Gabby Gabreski (1919-2002), American fighter ace in both World War II and the Korean War
- Gabrielle Giffords (born 1970), U.S. congresswoman from Arizona; a survivor of the 2011 Tucson shooting
- Gabby Hartnett (1900-1972), American Major League Baseball catcher and manager
- George "Gabby" Hayes (1885–1969), American actor
- Eugenio Lopez III (born 1952), chairman and CEO of Philippine media conglomerate ABS-CBN
- Gabby Pahinui (1921–1980), Hawaiian musician
- Gabrielle Reece (born 1970), American professional volleyball player, sports announcer, fashion model and actress
- Gabourey Sidibe (born 1983), American actress known for her Oscar-nominated role in the film Precious
- Gabby Street (1882-1951), American Major League Baseball catcher, manager, coach and radio broadcaster
- Mighty Gabby (born 1948), Caribbean folk singer
- Gabby Douglas (born 1995), American gymnast who rose to prominence during 2012 London Olympics
In fiction:
- Gabby (cartoon), a Fleischer Studios cartoon series and character
- Gabby Sharpe, a character from the British soap opera Hollyoaks
- Gabby, a character from the computer-animated series Pet Alien