Gabbar Singh from "Sholay" (1975) Played by Amjad Khan, Gabbar Singh is Perhaps the most iconic Bollywood Villain ever.

Shakaal from "Shaan" (1980) Shakaal is a bald, suave villain who bacome synonymous with evil. The character was played by Kulbhushan Kharbanda.

Dr. Dang Kher "Karma" (1986) Actor Anupam kher is still known as Dr. Dang who is a brilliant yet evil mastermind planning to wreak havoc. 

Mogambo from "Mr.India" (1987) Played by Amrish puri, Mogambo is a supervillain known for his distinct style and dialogue delivery.

Kancha Cheena from "Agneepath" (1990 and 2012) Originally played by Danny Denzongpa and later reprised by Sanjay Dutt in the remake.