Sylvester Stallone's height is 5ft 8.5in (174 cm)
Peak height was 5ft 9in (175 cm)
American actor best known for films like Rocky and Rambo. "I'm shorter and skinnier than you Expected". In a 1991 interview with Longevity magazine he says: "I'm 5'10" and in 1993 NY Times said "I'm exactly 5 feet 10 1/2 inches". A 1978 Playboy claim, as commenter Bam pointed towards quoted Sly claiming early on that "I'm five feet ten and three quarters tall"
Cinema.com on meeting him, "Sly, shorter than you expect at 5-foot-eight" and pre-www, in 1990 Chicago Times was even bringing up the subject of footwear, "The real-life Rambo is an official 5 foot 10 1/2 inches tall, but that is with the generous boost of what can only be described as elevator shoes". Indeed, a specialist shoemaker once commented that "I made him 4.5 inches taller for 16 years!", although that might be a bit of an exaggeration..
Another interesting quote is from famous screenwriter Goldman's book about lies stars tell. He says "I had a hot lead that Sly was 67 inches." going on to revealing his source was someone who was also that height and jogged with Sly one morning. He then describes how he went into a swimming pool that Sly was in...and about 10 minutes later, "He (sly) got out, grabbed a towel. I got out, grabbed a towel. He stood. I stood. Sixty-seven inches. Dripping wet."
Another quote comes from Supermodel Janice Dickenson's book 'Everything about me is fake' whom she recalls Sly tried picking her up (they were a couple for a while): "Who was this guy to go dissing me while he's standing there in his custom-made elevator shoes." and also remarked "I couldn't believe how short he was". Another actress, Melinda Dillon from F.I.S.T, commented in Chicago Tribune "I'm taller than Sly and that bothers him and we kid about it so I take off my shoes in some scenes. I can't slouch or I wouldnt be Anna. She's very upright."
Fellow action stars have even mentioned his height, Van Damme once saying: "I'm 5-foot-10, a good size for movies. If you're too big a guy, it's hard to find good villains. That's why Stallone always has good villains. He's short."