Most of our celebrations took place over the weekend, but Halloween isn't over yet.
Lots of people have gone above and beyond with their costumes this year, and we just had to show you some of the best ones we spotted on social media.
Fair play, lads. Fair play.
Credit: Aoife Murray
2. Patty and Selma Bouvier
With a bonus Mugatu in the background.
Credit: Dawn Prendergast
3. Fragile Masculinity
Credit: Steve Furlong
Credit: Niamh Hogan
5. The Sanderson Sisters (Hocus Pocus)
Credit: Lisa Haskins, Geraldine Haskins, Amanda Haskins
6. Lidl mermaid
7. Wacky Waving Inflatable Arm Flailing Tube Men
Credit: Jessica Patterson