Janet Carroll is a villainess from the Arrow episode 5.02, "The Recruits."
She was played by Suki Kaiser, who also played villainous werewolf pack leader Rose on Supernatural.
Janet Carroll is the CEO of AmerTek Industries, and after VP Evan Wender was attacked by Ragman, she is promised by Oliver Queen that she'll be protected at an event regarding the opening of a medical clinic. Despite Oliver and his new team of recruits attending the event, Janet is attacked by the Ragman and ends up hospitalized.
Once Oliver learns that Janet was released, Thea is sent to attempt to talk Janet out of filing a lawsuit due to the events, only to find Janet meeting with crime lord Tobias Church, with the revelation that Janet was selling weapons to Church for a $100 million payout. It was also revealed that AmeriTek was facing bankruptcy, and Janet's villainous deal was made to prevent it from happening. During another meeting with Church, the evil Janet again encountered Ragman, who was seeking revenge on AmerTek, but she escapes after Oliver orders Ragman to let her go.