• Album Version (6:33)
• 7" Edit (3:58) Who Is It [US 7" Single]; Who Is It [US Cassette Single]; Who Is It [US Promo CD ESK 74406]; Who Is It [UK Promo CD PRO 698]; The Essential Michael Jackson [US, European & International Edition] (2005); King Of Pop [Compilations] (2008)
• 7" Edit With Intro (4:10) Who Is It [UK & European 7" Singles]; Who Is It [European CD Maxi-Single]; Who Is It [Japanese 3" CD Single]; Who Is It [UK Promo CD PRO 698]; Tour Souvenir CD Single [Japanese Box Set] (1992)
• Acapella (Brothers In Rhythm A Cappella) (2:20) Who Is It [US Promo 2x12" E2S 4686]
• Demo / Alternative Version (7:46) Dangerous (Album Test Pressing, DAT (digital audio tape), 1990); Internet Leak (2002)
• This Is It Instrumental (1:24) This Is It [Movie]
• The Most Patient Mix / Patience Mix (The Brothers Patience Mix) (7:41) Who Is It [European 12" Single]; Who Is It [European, Japanese CD Maxi-Single]; Who Is It [UK & Europe CD Single]; Who Is It [European & UK 12" Singles]; Who Is It [US Promo 2x12" E2S 4686]; Who Is It [Japanese CD Maxi-Single]
• This Is It Instrumental (1:24) This Is It [Movie]
• The Most Patient Mix / Patience Mix (The Brothers Patience Mix) (7:41) Who Is It [European 12" Single]; Who Is It [European, Japanese CD Maxi-Single]; Who Is It [UK & Europe CD Single]; Who Is It [European & UK 12" Singles]; Who Is It [US Promo 2x12" E2S 4686]; Who Is It [Japanese CD Maxi-Single]
• IHS Mix (7:56) Who Is It [European & UK 12" Singles]; Who Is It [European, Japanese CD Maxi-Single]; Who Is It [UK & Europe CD Single]; Dangerous - Collector's Edition [Australian 2-CD Album] (1993); The Ultimate Collection (2004)
• P-Man Dub (7:27) Who Is It [European & UK 12" Singles]; Who Is It [US Promo 2x12" E2S 4686]; Who Is It [European, Japanese CD Maxi-Single]
• The Oprah Winfrey Special Intro (3:58) Who Is It [US Cassette Single]; Who Is It [US CD Maxi-Single]; Who Is It [US Promo CD ESK 74406]
• Patience Edit (4:02) Who Is It [US CD Maxi-Single]; Who Is It [US Promo CD ESK 74406]
• Patience Beats (3:23) Who Is It [UK Promo 12" XPR 1797]; Who Is It [US Promo 2x12" E2S 4686]
• House 7" (Brothers In Rhythm House 7") (3:50) Who Is It [US CD Maxi-Single]; Who Is It [US Promo CD ESK 74406]
• Brothers In Rhythm House Mix (7:09) Who Is It [US 12" Single]; Who Is It [US Promo 2x12" E2S 4686]; Who Is It [US CD Maxi-Single]
• Tribal Version (7:45) Who Is It [US 12" Single]; Who Is It [US Promo 2x12" E2S 4686]
• Brothers Cool Dub (5:47) Who Is It [US 12" Single]; Who Is It [US Promo 2x12" E2S 4686]
• Lakeside Dub (6:37) Who Is It [US 12" Single]; Who Is It [US Promo 2x12" E2S 4686]; Dangerous - The Remix Collection [Japanese CD Compilation] (1993)
• Moby's Raw Mercy Dub (8:59) Who Is It [US Promo 2x12" E2S 4686]; Dangerous - The Remix Collection [Japanese CD Compilation] (1993)
• Brotherly Dub (5:45) Who Is It [US Promo 2x12" E2S 4686]
