Kyle Broflovski wearing his pajamas.

Kyle Broflovski, voiced by Matt Stone, is a fictional character on the animated series South Park.

He and Stan Marsh alternate as leader of their group/voice of reason. Kyle is evidently the only Jewish kid in town (of Russian or perhaps Serbian ancestry) and is often mocked for it by Eric Cartman.

Kyle is the smartest of the four main kids and also quite witty. Unlike Stan, however, he tends to be quite nervous and is less likely to want to get involved in uncertain situtations. He has the least amount of patience with the antics his fairweather friend Eric Cartman.

His mother, Sheila, is very overprotective: she instigates a war between the USA and Canada in the feature-length movie South Park: Bigger, Longer & Uncut because of (Canadian natives) Terrance and Phillip's extremely scatological R-rated movie. Mrs. Broslofski is very prone to "making a mountain out of a molehill" whenever something threatens her son. Even so, in the Cherokee Hair Tampons episode she turns to holistic and nature medicine when Kyle almost dies of kidney failure due to diabetes. Stan is very upset about the possible death of Kyle (much more than about the deaths of Kenny), and ultimately saves him by tricking Cartman into donating one of Cartman's kidneys to Kyle.

Kyle's father Gerald is a lawyer, but Kyle reiterates that despite his father's profession, they are not as wealthy as Token Williams, whose father is also a lawyer.

Kyle's most notable catch phrase is to exclaim "You Bastard(s)!" following Stan's catch phrase "Oh my god, they killed Kenny!"

He wears a bright green ear-flapped cap (or ushanka), a bright orange jacket with black-edged pockets with a dark green collar, dark green pants and lime-green mittens. He is rarely shown without his cap, but without it he has a bright red-to-auburn afro.

Kyle has an adopted younger brother, Ike. Ike's birth parents are Canadian.

He also has a cousin named Kyle who is a big nerd.

Kyle's last name has been alternately given as Broslovski, Broflovski, and Brovlovski in the series, although the characters say "Broflovski". In the Spontaneous Combustion episode 302 there is a shot of Kyle's father Gerald's law office - on the façade it says 'Brovlovski'. In the Sexual harasssment episode his name is shown as 'Broflofski'.

Matt Stone has said that Kyle was loosely based on himself when he was younger.