Reggie is a ring-tailed lemur that Sterling Archer stole during a drunken night of partying.
At first, he was quite unmanageable as he got into Sterling's pudding cups (and also bit a prostitute). He has since become more tame. Woodhouse named the Lemur after Reggie Thistleton, the pilot he served under during World War I. He also taught the lemur to tie off his arm to help him shoot up heroin and work the stereo ("Be a lad. Put on some Mingus.").
- In "Honeypot," the lemur first appears in Archer's Apartment as part of the aftermath of a night of crazy partying.
- In "Job Offer," the lemur assists Woodhouse in shooting up heroin.
- Reggie the lemur is used as an excuse for Archer to meet Lucas Troy in "The Wind Cries Mary". Lana says Archer bought the lemur, likely from its original owner. Pam says "That lemur's hosed" in reference to Reggie when it is discovered Archer requisitioned two HK MP5s from the ISIS armory rather than a tranquilizer gun.
- In "Robot Factory", Reggie is discovered by Archer in his closet, seemingly deceased. After lambasting his newest valet, Alcott, for not feeding the lemur (which is impossible as Alcott literally started working for Archer that very morning) Archer instructs him to bury Reggie. When getting close, Reggie suddenly attacks revealing he's alive.