Onsen Etiquette in Japan: What First-Timers Get Wrong (Including the Tattoo Rule)

The one etiquette guide worth reading before you pack a swimsuit you won't be allowed to use.

An onsen (温泉, natural hot spring) is one of the best experiences Japan offers — and one of the easiest to get wrong on your first try. Almost every mistake here comes from the same source: treating it like a swimming pool instead of what it actually is, a shared bathing space with its own long-standing rules.

Here's what to know before you go, including the one policy that catches more travelers off guard than anything else.

🚿 Wash Before You Soak

The onsen itself is for soaking, not washing. Every onsen has a washing area beforehand — small stools, handheld showers, soap, and shampoo.

• Sit on the stool and thoroughly wash and rinse your entire body before entering the bath.
• Make sure all soap and shampoo is fully rinsed off — none of it should end up in the shared water.
• This isn't a quick rinse; take the time to actually clean yourself the way you would in a normal shower.

👕 No Swimsuits, and Yes, You're Actually Nude

This surprises a lot of first-time visitors: traditional onsen are entered completely nude, no swimsuit allowed. Baths are separated by gender (look for 男 for men's and 女 for women's at the entrance — colors are often blue/red but don't rely on color alone), and once inside, everyone is in the same state, so it's far less awkward in practice than it sounds in advance.

If the idea of a fully nude shared bath isn't for you, look specifically for a private onsen (貸切風呂, kashikiri buro) — many ryokan and onsen facilities offer these for booking as a couple, family, or solo, giving you the experience without the shared-bath part.

🧖 The Small Towel

You'll typically get a small hand towel (手ぬぐい or a rental towel) at check-in. The etiquette:

• Use it to preserve modesty while walking from the washing area to the bath
• Never let the towel touch the bathwater — most people fold it and set it on top of their head, or leave it on the edge of the bath
• Your larger bath towel (for drying off afterward) stays in the changing room — it doesn't come into the bathing area at all

🖋️ Tattoos: The Policy That Catches People Off Guard

This is the single most-asked question about onsen, and the honest answer is: it depends on the facility. Tattoos have historically been associated with organized crime in Japan, and many traditional onsen still ban visible tattoos entirely, regardless of size or meaning.

That said, this is changing — especially in areas with more international visitors. Your options if you have tattoos:

• Check the facility's website or call ahead — many now explicitly state their tattoo policy
• Look for onsen advertised as "tattoo-friendly" — a growing and searchable category, especially in tourist-heavy areas
• Use cover-up patches or tape for smaller tattoos — some facilities accept this as a compromise
• Book a private onsen (kashikiri buro) — this sidesteps the issue entirely, since you're not sharing the space

🤫 In the Bath Itself

• Keep your voice down — an onsen is meant to be relaxing, not social in a loud sense.
• Don't swim, splash, or submerge your head — this is a soaking bath, not a pool.
• Tie up long hair so it doesn't touch the water.
• Avoid photos in the bathing area entirely — even an empty-looking bath may have other guests nearby, and phones are generally unwelcome in these spaces regardless.

JNTO's official onsen guide is a great companion resource if you want to go deeper.

⚠️ 7 Mistakes First-Timers Make

1. Getting in without washing first — the washing station comes before the bath, always.
2. Wearing a swimsuit — traditional onsen are nude-only; look for kashikiri buro if that's a dealbreaker.
3. Letting the small towel touch the water — keep it on your head or the bath's edge.
4. Assuming all onsen ban tattoos, or assuming none do — it genuinely varies; check ahead.
5. Bringing your phone into the bathing area — leave it in the changing room.
6. Swimming or submerging your head — it's a soak, not a pool.
7. Skipping the rules posted at the entrance — individual facilities sometimes have their own specific variations worth a quick glance.

📋 Your Cheat-Sheet Recap

Once you know the sequence — wash, rinse, towel on your head, soak quietly — an onsen stops being intimidating and just becomes one of the best parts of the trip.