ER is an Emmy-winning American serial medical drama created by novelist Michael Crichton and set primarily in the emergency room of fictional County General Hospital in Cook County, Chicago, Illinois. It shares some cast and crew members with Oz.
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- Eamonn Walker played Dr. Stephen Dakarai in ER and Muslim leader Kareem Saïd in Oz.
- Ernie Hudson played Colonel James Gallant in ER and Warden Leo Glynn in Oz.
- John Doman played role as Dr. Carl DeRaad in ER and Edward Galson in Oz.
- Aasif Mandvi played Manish in ER and Dental worker Tariq Faraj in Oz.
- Michael Hyatt played Yvonne Devilliere in the season 13 ER episode "Breach of Trust" and Sadiyo Khan in the Oz episode "Out o' Time".
- Elizabeth Rodriguez played Nurse Sandra in ER and Maritza Alvarez in Oz.
- Jacques Smith played Peter in ER episode "Makemba" and Leroy Tidd/Salah Udeen in Oz.
- Lee Tergesen played Demoral Junkie in ER episode "Insurrection" and played inmate Tobias Beecher in Oz.
- Conrad Lindsay played Mel in ER episodes "Death and Taxes" & "Freefall" and Muslim inmate Sanjay Afsana in Oz.