Leprechaun Movies: Release Order
The Leprechaun franchise is a cult horror-comedy series that follows the murderous adventures of a malevolent Irish leprechaun (primarily played by Warwick Davis) as he hunts down those who steal his precious gold. While featuring the same character, each film in the series is essentially a standalone story with minimal continuity between entries.
The watch order takes you from the original 1993 film starring a young Jennifer Aniston through increasingly outrageous scenarios including Las Vegas casinos, urban settings, and outer space. The 2014 entry Leprechaun: Origins is a complete reboot that reimagines the character as a more primal, non-speaking creature and does not feature Warwick Davis as the leprechaun.
There is 1 other watch order available - see the link up above.

Leprechaun
A murderous leprechaun hunts down a group of people who he believes have stolen his precious gold, unleashing supernatural terror in his relentless pursuit.

Leprechaun 2
The murderous Leprechaun returns to the big city, obsessively pursuing a young woman while leaving a trail of bodies in his wake. When her boyfriend steals one of the creature's gold coins, the Leprechaun's deadly rampage intensifies.

Leprechaun 3
A one-handed man brings a leprechaun statue to a Las Vegas pawn shop, but when the owner removes its protective medallion, the murderous creature is unleashed upon the neon-lit city.

Leprechaun 4: In Space
A power-hungry Leprechaun kidnaps an alien princess to steal her royal title and rule the universe, but his plans are disrupted when Earth marines arrive to rescue her. The crafty Leprechaun infiltrates their spaceship and terrorizes the crew in his quest to reclaim his captive bride.

Leprechaun in the Hood
Three aspiring rappers steal a magical flute from a hip-hop mogul's studio to fund their demo, but their newfound success attracts the wrath of both the mogul and a murderous Leprechaun who wants his treasure back.

Leprechaun: Back 2 tha Hood
When Emily Woodrow and her friends discover a treasure chest full of gold coins, they ignore warnings about a vengeful Leprechaun who will stop at nothing to reclaim his stolen gold.

Leprechaun: Origins
Two young couples backpacking through Ireland encounter the terrifying reality behind one of the country's most infamous legends.
Other Film Series
Bring It On
Cheerleading competition anthology series that began with a cult classic teen comedy and spawned six standalone sequels.
Critters
Horror-comedy franchise about small, ravenous alien creatures called Crites terrorizing Earth, featuring a complete four-film story arc and a later soft reboot.
Phantom of the Opera
Feature film adaptations of Gaston Leroux's classic Gothic romance about a disfigured musical genius haunting the Paris Opera House.
Re-Animator
A cult horror-comedy trilogy following mad scientist Herbert West's experiments in reanimating the dead, based on H.P. Lovecraft's story.
Tremors
Kevin Bacon and Michael Gross battle subterranean Graboids in this cult monster franchise spanning three decades.
Universal Monsters
Universal's iconic classic monster films from 1931-1956, featuring Dracula, Frankenstein, the Wolf Man, the Mummy, the Invisible Man, and the Creature from the Black Lagoon.