Harper Valley PTA is a 1978 American comedy film inspired by the popular 1968 country song "Harper Valley PTA" written by Tom T. Hall and performed by country singer Jeannie C. Riley. The film starred Barbara Eden, Nanette Fabray, Ronny Cox, Louis Nye and Susan Swift, directed by Richard Bennett and Ralph Senensky (who left the production during filming, and was replaced by Bennett), and primarily released to drive-in theaters throughout the summer of 1978. The film has a cult following in fans of the original song. The film's promotional tagline is: "The song was scandalous. The movie is hilarious!"

Stella Johnson is a beautiful widowed single mother who lives in the town of Harper Valley, Ohio. She sells cosmetics door-to-door for the fictitious AngelGlo Cosmetics and is not afraid to enjoy life. Her fourteen-year-old daughter, Dee, is a student at Harper Valley Junior High School.

After leaving school, Dee brings her mother a letter from the school's Parent-Teacher Association board, which is led by the pompous and snobbish Flora Simpson-Reilly. The letter denounces her for her not following the societal mores of the day and the community and threatens to expel Dee from school if Stella does not change her ways more to the board's liking.

Infuriated by the board's supposed superiority and their glaring hypocrisy, Stella storms to the PTA meeting being held that day and proceeds to tell most of the PTA members off by exposing their hidden skeletons for the town to see.

After her house is toilet papered and a rock with a vile note attached is thrown through her window in retaliation, Stella prepares to get even with those who would want her driven out of town. She teams up with her friends, beautician Alice Finley and bartender Herbie Maddox, and (along with Dee's help) exacts revenge on six of the hypocritical PTA members, with methods that include: tricking a married male board member who has repeatedly tried to date Stella into a disastrous rendezvous; embarrassing Mrs. Simpson-Reilly at one of her grand social gatherings; exposing the secret antics of a supposedly prim-and-proper female board member/teacher; and sending a herd of pink-painted elephants into the bedroom of an alcoholic board member.

Stella finds out that one of the male PTA members, wealthy Willis Newton (who was not a party to the PTA letter), has fallen in love with her. Will and another male on the PTA board, Skeeter Duggan, the town's notary public, are sympathetic to Stella and do not agree with Flora and her cronies. After being informed by Will of the current PTA board's incompetence and mismanagement and with his help, Stella is convinced to make a run for President of the PTA, a move which infuriates Flora and her allies.

After a makeover, which sees her braces removed and her hair styled, Dee also finds a boyfriend in handsome Carlyle, a popular school track star, which incurs the jealousy of Bettina Reilly, the equally snobbish granddaughter of Flora. Also shown are Edwina, Bettina's identical twin sister who is just as snobbish as Bettina, and Dee's best friend Mavis.

Real estate agent Kirby Baker, a member of the PTA Board, plans to ruin Stella by foreclosing on her house (which his company owns) but is arrested for assaulting Myrna Wong, an Asian-American martial arts expert helping Stella to set up the lecherous Baker. Now things become more and more desperate.

The board finally decides to resort to criminal means to maintain the power they hold, which is fast slipping away thanks to Stella's growing popularity. The board members then decide to hire a couple of thugs named Dutch and Tex to have Skeeter abducted so they can commit election fraud. The two assailants assault Skeeter and take him to a nearby abbey, where he is plied with wine to make him drunk.

Olive Glover, the PTA's Recording Secretary who has a hardcore gambling addiction, has stolen money from the Milk Fund Rally, one of the PTA's numerous fundraisers, and intends to have Mavis framed for the crime and arrested. Leaving Dee to stall the PTA Board meeting, Stella and Alice follow Olive to a racing stable and recover the stolen money, some of which had been marked by Will.

As Stella and Alice race back to town, Will and Herbie spot the kidnappers and Skeeter outside the abbey from a helicopter and notify the girls. Disguised as nuns, Stella and Alice find Skeeter, free him, and manage to escape with him after a wild car chase ending with the kidnappers crashing into a stream.

Ultimately, Flora's scheme to prevent Stella's nomination fails miserably: Olive, who would have been the swing vote against Stella, is arrested for embezzlement just as the PTA Board is about to vote against Stella's candidacy. Dutch and Tex, already in custody for the Skeeter Duggan kidnapping, tell the police that Flora was behind it all to keep Stella off the PTA Board.

Stella decisively wins the election and becomes the new PTA president, with the whole town voting to get rid of Flora and her snobbish friends. Will and Stella then fly off in his helicopter to get married. As they take off, and the credits begin to roll, a banner is seen flying from the back of the helicopter reading, "STELLA JOHNSON FOR MAYOR."

• Barbara Eden as Stella Johnson, a widowed cosmetics salesperson with a young daughter, whose joie de vivre, principles, and individuality anger most of the powerful people in town and on the Parent-Teacher Association board.
• Ronny Cox as Willis "Will" Newton, a wealthy member of the PTA who doesn't agree with Flora and her snobby allies and is in love with Stella.
• Nanette Fabray as Alice Finley, Stella's best friend and co-conspirator against the snobs of Harper Valley. She owns and operates the La Moderne Beauty Shop.
• Louis Nye as Kirby Baker, a local real estate agent who is allied with Flora and her friends. Notorious for being a lecherous playboy and infamous for impregnating his secretaries.
• John Fiedler as Bobby Taylor, a man on the PTA who lusts after Stella.
• Ron Masak as Herbie Maddox, the head bartender at Kelly's bar, and Stella's ally against Flora and her friends. He has a crush on Stella, and is one of her friends.
• Clint Howard as Corley, a young delivery person, who works for the local florist shop, who brings Stella flowers from Will.
• Susan Swift as Dee Johnson, Stella's 14-year-old daughter, who is threatened with expulsion from school if her mother doesn't conform to the way the PTA wants her to behave.
• Pat Paulsen as Otis Harper, the descendant of the founding family of Harper Valley. A PTA member who is allied with Flora and her friends. Has a tendency to drink all the time, which annoys his wife, Bertha.
• Amzie Strickland as Shirley Thompson, a member of the PTA board who tends to drink a lot of gin.
• Bob Hastings as Skeeter Duggan, a member of the PTA board, and the town's Notary public who is sympathetic to Stella.
• Audrey Christie as Flora Simpson-Reilly. She is the pompous and extremely snobbish president of the PTA board who thoroughly despises Stella.
• Molly Dodd as Olive Glover, the recording secretary of the PTA who is a gambling addict.
• Fay DeWitt as Willamae Jones, a snide biology teacher at the junior high school who is also a member of the PTA.
• Louise Foley as Mavis, Dee Johnson's best friend, who is nearly framed for a crime she did not commit by the vindictive Olive Glover.
• Brian Cook as Carlyle, a popular track star.
• Laura Teige as Bettina Reilly, One of Flora's twin granddaughters, who wants to be with Carlyle, and is jealous when he chooses Dee over her.
• Jan Teige as Edwina Reilly, Bettina's twin sister, who is just as snotty.
• Irene Yah-Ling Sun as Myrna Wong, a friend of Stella's who is a judo expert.
• Tobias Anderson as "Cranky" Barney Crunk, the town's nosy mailman who has the habit of peeking in everyone's mail.
• Royce D. Applegate as Dutch, one of two kidnappers who abduct Skeeter Duggan at Flora Simpson-Reilly's orders.
• J. J. Barry as Tex, the mastermind of the kidnap plot to get Skeeter Duggan out of the way.
• Pitt Herbert as Henry Reilly, Flora's overly dominated husband and grandfather to Edwina and Bettina. Henry is wealthy, but is very weak-willed and is known for acquiescing to his wife's schemes.
• Arlen Stuart as Bertha Harper, wife of Otis Harper, who gets annoyed by her husband's continual drinking.
• Woody Harrelson as an extra.^[2]

Harper Valley PTA: Original Soundtrack Recording was released in June 1978 on vinyl, cassette tape and 8-track tape by Plantation Records. To promote the film's release and its soundtrack, the title song by Jeannie C. Riley was re-issued as a single. The album made its CD premiere through Varèse Sarabande on October 27, 2017.

Side 1

1. "Harper Valley PTA" – Jeannie C. Riley (3:12)
2. "Dee's Visit" (instrumental) – Nelson Riddle (2:10)
3. "Mr. Harper" – Barbara Eden (2:22)
4. "Alice's Place" (instrumental) – Nelson Riddle (2:29)
5. "High School Confidential" – Jerry Lee Lewis (3:07)
6. "Willie May" (instrumental) – Nelson Riddle (2:01)

Side 2

1. "Harper Valley PTA" (instrumental) – Nelson Riddle (1:55)
2. "Widow Jones" – Barbara Eden (2:38)
3. "Twin Tune" (instrumental) – Nelson Riddle (1:30)
4. "Ballad of a Teenage Queen" – Johnny Cash (2:51)
5. "Ice Cream Disco" (instrumental) – Nelson Riddle (1:48)
6. "Whatever Happened to Charlie Brown" – Rita Remington & Carol Channing (2:40)
7. "Ending (Reprise: Harper Valley PTA)" (instrumental) – Nelson Riddle (1:06)

In 1981, Harper Valley PTA was made into a television sitcom (created by Sherwood Schwartz) which aired on NBC from January 1981 to May 1982. Barbara Eden reprised her role as Stella Johnson for the series which lasted two seasons and a total of 30 episodes were produced.