Mentioned in a host segment in the The Day the Earth Froze episode of Mystery Science Theater 3000. The crew is wondering exactly what a Sampo is when Joel suggests, "Sampo: a progressive new corporation with an eye towards the future! Sampo is a company for people, by people!"
Parodied in a MADtv sketch. It spoofed Grey's Anatomy, and at one point Dr. Gregory House from House shows up to provide a new pair of eyes on the medical case they are struggling with. He argues with Dr. Grey, and she calls him a sexist pig as she says that Grey's Anatomy is "a show written for women by women". House counters with saying that he finds her hot and points out that he has an erection, and says that House is a "a show written by men for women who like abusive men".
Futurama has the variation "By a robot, for a robot".
Used in The Simpsons, where some executives try to convince Lisa that their exploitation of schoolchildren to gather statistical data for toys is justified because the products are made by children, for children, with all the profits going to children. Since we're all somebody's children.
In another episode, Krusty advertises Itchy and Scratchy T-shirts as being made "for kids, by kids - and we pass the slavings on to you!"
Kidsongs, a show with sing-alongs to kid-friendly fare like "We're Gonna Get Wet", had as its motto: "By kids, for kids, and starring kids!"
One American Anime convention described itself as "By fans, for fans".
FUBU— "Urban" clothing company, stands for "For Us, By Us."
A Victoria's Secret commercial used the phrase "Designed by a woman, for women".
Older Than Radio: Abraham Lincoln's famous Gettysburg Address contains the phrase: "a government of the people, by the people, for the people". Quite possibly the only other part of the speech most people remember other than "Fourscore and seven years ago..."