The bathroom is the last room I decorate for Halloween, which means it usually gets forgotten. This year I gave it ten minutes and it might be my favorite spot in the house. These are the simple ideas that worked.
1. Start with themed hand towels
Swap the everyday hand towels for black or orange ones. I found ones with a small spiderweb print and they set the whole tone. Fold them neatly on the towel ring so the pattern shows. Towels are the easiest seasonal swap in the house. They wash well and I reuse them every October.
2. Add a Halloween soap dispenser
A pumpkin-shaped soap dispenser sits next to my sink now. I refill it from the big soap bottle under the sink, so it is just a fun shape doing an everyday job. Guests always notice it before anything else. Small themed touches like this do more work than a big display.

3. Hang a festive shower curtain
The shower curtain covers the most wall space in the bathroom, so one swap changes the whole room. Mine has little bats on a cream background. It is not scary, just fun. I store it with the towels and it comes out every fall.
4. Style a small tray on the vanity
A little tray keeps the counter from looking cluttered. I put a candle, the soap dispenser, and a folded washcloth on mine. Everything has a home and wiping the counter takes seconds. The tray makes ordinary items look styled.
5. Put bat decals on the mirror
Static-cling bat decals stick to the mirror with no adhesive. I placed a few flying across the top corner. They peel off in November without a trace. My kids rearrange them every other day, which is half the fun.

6. Set a pumpkin on the toilet tank
The back of the toilet is free display space. A small real pumpkin sits on mine all October. I pick a squat one that sits flat and will not roll. It is such a simple move and it always makes me smile.
7. Swap the bath mat
An orange or black bath mat changes the floor instantly. Mine is a plain dark orange that hides everything. It matches the towels without matching too hard. Rugs and mats are the fastest way to shift a room’s mood.
8. Line the tub edge with tea lights
Battery tea lights in orange holders line the edge of my tub. They glow without any fire worry. I turn them on for evening baths in October. The bathroom feels like a little retreat.

9. Hang a mini wreath on the door
A small wreath on the inside of the bathroom door adds fall texture. Mine is dried wheat with a black ribbon. It takes up zero counter space. Doors are underused decor spots.
10. Keep one fall scent
I switch the bathroom spray to a cinnamon and clove scent for October. Scent ties the whole look together. One bottle by the sink is all it takes. The room smells like the season every time you walk in.
Conclusion
Halloween bathroom decor does not need to be big or scary. A few swapped towels, a pumpkin, and some candlelight turn the smallest room into part of the fun. Start with the towels and see where it goes.