Edna Krabappel-Flanders (née Krabappel /krəˈbɑːpəl/ ^ⓘ krə-BAH-pəl) is a fictional character from the American animated sitcom The Simpsons, voiced by Marcia Wallace. A 4th-grade teacher, she teaches Bart Simpson's class at Springfield Elementary School. In the twenty-third season, she marries Ned Flanders.

Following Marcia Wallace's death in 2013, the show's producers announced that her character would be retired. The epilogue of the season 25 episode "The Man Who Grew Too Much" marks Edna Krabappel's final original speaking role.

Edna Krabappel holds a Master's from Bryn Mawr College. She is a surly, grumpy and jaded caricature of the American public school system. In "The Seemingly Never-Ending Story", it is revealed that she was once a very optimistic woman who genuinely wanted to help people in need. However, after years of frustration with the school, and her constant battles with Bart Simpson in particular, she eventually became a much more bitter person.

There is some inconsistency about Edna's origins. She is said to have come to Springfield to begin teaching in "The Seemingly Never-Ending Story". However, in a case of retconning, she can be seen in "Springfield Up" as a student running through the background at Springfield High School while a young Chief Wiggum is filmed carrying out his duties as a hall monitor as part of the documentary featured in that episode.

Edna smokes heavily, including during school hours. In the episode "Grade School Confidential", she and Principal Skinner have a romance after they are invited to Martin Prince's birthday party. They are witnessed kissing in Martin's playhouse by Bart. Principal Skinner then sends Bart to relay a message to Edna in front of his classmates who laugh at him, making him furious. He then shows them what they are doing and tells them not to tell anyone about their relationship, especially Superintendent Chalmers. Unknown to Bart they lose their jobs when Superintendent Chalmers finds out about their affair via Chief Wiggum and they lock themselves in the school with Bart until they are reinstated. They apologize to Bart for embarrassing him. After returning to their jobs, they resume their romance in a janitorial closet. In "Bart Gets a 'Z'", she is fired from teaching when she becomes drunk after drinking coffee that was spiked with alcohol by Bart. She later decides to open a muffin store. She is later rehired when the substitute teacher gets drunk. In "Moms I'd Like to Forget", she fights a fifth grade teacher, Mike, who talks badly about her students; this leads to a massive teacher brawl. In "The Ned-Liest Catch", she is suspended from teaching for slapping Bart and is placed in the Teacher Holding Facility. When Bart attempts to free her, she falls off a ladder but is saved by Ned Flanders.

A recurring theme is Edna's desire for a romantic partner. She is divorced; in "Separate Vocations", she implies that her husband left her for their marriage counselor with whom he had an affair. In early episodes, she is shown as very sexually aggressive and promiscuous: in "Flaming Moe's", she is shown with her arms around two sailors in the parody of the famous Cheers theme, and tries to pick up Aerosmith drummer Joey Kramer and Homer Simpson, even after learning he is married and is Bart's father. In "Bart's Friend Falls in Love", while the children are watching an unseen explicit scene in Fuzzy Bunny's Guide to You-Know-What, a sex ed film, she says to the children in disgust, "She's faking it". In the same episode, Nelson Muntz asks why she does not live with "Mr. Krabappel"; she tells him that her ex-husband "chased something small and fluffy down the rabbit hole". In "One Fish, Two Fish, Blowfish, Blue Fish", she has a "hot encounter" with a local Japanese sushi chef in the backseat of her car.

The episode "Bart the Lover" was the first episode to give Edna a central role, and also to expand her character and personality. In the episode, she has a personal ad placed in the newspaper so she can find a man. The advertisement is answered by Bart – under the alias of "Woodrow", a seemingly perfect male lover named after former President Woodrow Wilson – as a prank. This results in a cycle of romantic letters between both Edna and "Woodrow". Intending to finish the prank, Bart invites Edna to the Gilded Truffle Restaurant so she can meet with Woodrow. Edna waits expectantly for Woodrow, but is heartbroken after he does not appear. With his family's help, Bart writes a goodbye letter to Edna as Woodrow, satisfying her.

Edna appears to be desired by many men (and in one case even women, when Patty Bouvier once had a sexual fantasy with Edna), as seen in Sideshow Bob's outrage (in "Brother from Another Series") wherein his romantic date with her is ruined by a spying Bart: "You only get one chance with Edna Krabappel!"