The Sinestro Corps, occasionally known as the Yellow Lantern Corps, is a supervillainous group and analog to the Green Lantern Corps in the DC Universe. They are led by Sinestro, and derive power from the emotional electromagnetic spectrum of fear.

The Sinestro Corps first appeared in Green Lantern vol. 4 #10 and was created by Geoff Johns and Ethan Van Sciver.

The Parallax entity is a space parasite that is the embodiment of fear and was imprisoned within the Central Power Battery on Oa. This caused green power rings to be weak to the color yellow, and Parallax subsequently became known as the "yellow impurity" over time.

Thaal Sinestro, at the time the universe's greatest Green Lantern, was sent to Earth by Supernova in a plot to erase Guy Gardner from history. Booster Gold was assigned to prevent this from happening. To do so, he convinced Sinestro to leave Earth, claiming that he was an admirer from the future, and that his yellow Legion of Super-Heroes flight ring was a tribute to Sinestro. When asked what Corps he belongs to, Booster ad-libbed, "The...Sinestro Corps", leading Sinestro to twirl his mustache in thought while mumbling, "Of course...Of course."

After Sinestro went rogue, he was banished by the Guardians of the Universe to Qward in the antimatter universe. When he returned, he wielded a power ring which used yellow energy. After various encounters with Earth's Green Lantern, Hal Jordan, he was imprisoned within the Central Power Battery. There he was able to use his ring, which uses fear, as opposed to willpower, as a power source, to awaken Parallax from hibernation. From there, Parallax and Sinestro were able to influence the fall of Hal Jordan and instigate the fall of the Green Lantern Corps, leaving one last Green Lantern: Kyle Rayner.

After the Green Lantern Corps was restarted with the return of Hal Jordan, the Sinestro Corps began actively recruiting members, offering yellow power rings and a role in the Corps to those who can "instill great fear". Members of the Corps are immediately taken to Qward to "...be subjected to psychological and physical reconditioning". The members of the Sinestro Corps work in sectors, like the Green Lantern Corps. Qward also has a huge yellow Central Battery on its surface like the one used on Oa. Although the Sinestro Corps uses fear, and opposes the Green Lantern Corps and the Guardians, Sinestro has stated their goal is to bring order to the universe, which he claims the Guardians have failed to do.

Arkillo, a large and muscular vicious alien, is enslaving all the Qwardian Weaponers and forcing them to continuously build new yellow rings which are programmed to breach the barrier between the antimatter and matter universes to find and recruit new ring-wielders. Arkillo also serves as the Sinestro Corps' drill sergeant, similar to Kilowog's role in the GLC.

Members recruited include Karu-Sil, raised by animals; Despotellis, a sentient virus capable of attacking Lanterns from the inside; and Bedovian, the sniper of the Corps, capable of taking out a target from three sectors away.