Robert Sidney Gelbard (born March 6, 1944 in New York City) is a diplomat and former United States Ambassador to Bolivia (1988–91) and Indonesia (1999–2001).
He is a member of the American Academy of Diplomacy, and is a 1964 graduate of Colby College and a 1979 graduate of the Harvard Kennedy School, where he received a Master of Public Administration.
In the Clinton administration, he was an envoy to the Balkans.
In the Spring of 1998, he met with Slobodan Milosevic and warned him about NATO's possible use of military force against Serbia.
By May 1998, he suggested to the White House that they bomb Serbia, but the idea was originally rejected by NSA Sandy Berger.In February of that year, Gelbard described the Kosovo Liberation Army, Milosevic's foe in the Kosovo war as "without any questions, a terrorist group" and added that "we condemn very strongly terrorist activities in Kosovo."