There's one way to tell these (unknown) twins apart! (1 more in comments)
imgur.com category @Dr_Shrinker63
Another oldie (what was it with twins in the 70s?) - Denise and Diane Sloane (MIC)
imgur.com category @Dr_Shrinker63
Crystal and Marsha Allen - real twins, kinda hot, not-so-great picture quality (MIC)
imgur.com category @Dr_Shrinker63
Nathalie and Stephanie (I don't know their last names) from Playboy (AIC)
imgur.com category @Dr_Shrinker63
How Do Y'all Feel About Triplets? (Porto Triplets, album in comments)
imgur.com category @DickReckherd