Insidious Movies: Release Order
The Insidious franchise is a supernatural horror series that explores the terrifying realm known as The Further, where malevolent spirits prey on the living. This complete release order follows both the Lambert family saga and the backstory of psychic investigator Elise Rainier as original audiences experienced them.
This is the recommended viewing experience for first-time viewers, because the later prequels contain references and character developments that assume knowledge from the original films. The order preserves the intended scares, reveals, and emotional impact while showing how the franchise evolved from the Lambert family's supernatural struggles to exploring Elise's earlier cases and personal history.
There are 2 other watch orders available - see the links up above.

Insidious
When a family's young son falls into a mysterious coma, they discover their home is haunted by malevolent spirits seeking to possess him. They must venture into a supernatural realm called "The Further" to save their child's soul.
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Insidious: Chapter 2
The Lambert family continues to battle supernatural forces as they investigate a dark childhood secret that keeps them tethered to the dangerous spirit world.
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Insidious: Chapter 3
A teenage girl and her family face supernatural terror as they encounter the dark mysteries of 'The Further,' a sinister otherworldly realm.
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Insidious: The Last Key
Parapsychologist Elise Rainier investigates a haunting in Five Keys, New Mexico, only to discover the case involves her own childhood home and dark family secrets.
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Insidious: The Red Door
Josh Lambert and his college-aged son Dalton must venture deeper into The Further than ever before to confront their family's dark past and face new supernatural terrors lurking behind a mysterious red door.
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Other Film Series
Bryan Edgar Wallace
A series of German crime thrillers produced by CCC Filmkunst in the 1960s-70s, marketed under the name of Edgar Wallace's son Bryan, featuring standalone mysteries with gothic atmosphere and masked killers.
Child's Play
A horror franchise following the murderous adventures of Chucky, a killer doll possessed by the soul of serial killer Charles Lee Ray.
Friday the 13th
The murderous legacy of Crystal Lake and its iconic killer Jason Voorhees in this enduring slasher series.
Grindhouse
An exploitation cinema tribute that began as a 2007 double feature and spawned multiple spin-off films from its fake trailers.
Hellraiser
Supernatural body horror centered on a mysterious puzzle box and the sadomasochistic Cenobites led by Pinhead.
Nightmare on Elm Street
The iconic horror franchise following the burned child killer Freddy Krueger who stalks teenagers through their dreams.