Onsen and sento etiquette: the rules that actually matter, and the Japanese to ask first
An onsen is one of the easiest pleasures in Japan to enjoy and one of the easiest to get visibly wrong, because nearly every rule is unwritten and enforced by a room full of naked strangers who will say nothing at all. Nobody corrects you. They look, briefly, then look away, and you spend the next twenty minutes wondering what it was.
The good news is that the list is short. Exactly one rule genuinely matters - you wash completely before you get in - and after that it is a few habits involving a towel, your hair and your phone. Being foreign is not what people notice. Soap is.
What follows is the etiquette in the order you meet it, from the shoe cupboard to the moment you dry off, plus the Japanese for the two conversations that actually happen: asking about tattoos before you commit, and the front desk telling you something unexpected. Sento - neighbourhood baths with heated tap water rather than spring water - run on identical rules.
What is the one onsen rule you absolutely cannot break?
Wash first. Not a rinse - a proper wash, sitting on a low stool at one of the shower stations along the wall, soap everywhere, rinsed until no foam travels with you. The bath is shared and is not drained between guests. It is for soaking; everything else happens before you reach it.
Many places keep a basin by the edge for kakeyu: a few scoops of the hot water poured over yourself, feet first, before you step in. It eases you into the temperature and quietly tells the room you know what you are doing.
Stools and basins get rinsed and set upright afterwards. A basin and someone's toiletries left out at an empty station usually mean the spot is taken.
| What you want to say | Say it like this | Japanese |
|---|---|---|
| Is this spot free? For a washing stool when the row looks full. | Koko, aite imasu ka. | ここ、空いていますか。 |
| Go ahead, please. The whole answer. Also works for offering someone the tap first. | Douzo. | どうぞ。 |
What am I supposed to do with the little towel?
You get two. The big one stays in the locker to dry off with. The small thin one comes in with you: it washes you, screens you on the walk from shower to tub, and must never do the one thing it is always about to do, which is touch the bath water.
Park it on the rim, or folded on your head. Long hair goes up in a tie for the same reason. Nothing that has been on a body goes in the water.
On the way out, wring it and wipe yourself down before stepping into the changing room. That is why the floor in there is dry.
Can I use an onsen with a tattoo, and how do I ask?
The blanket ban is loosening, but unevenly, and a place that will turn you away does it politely at the desk after your shoes are already off. So ask first - on the phone, or standing in the entrance.
Three things usually rescue small ink: a cover sticker, sold at drugstores and online and handed over by some front desks; a private family bath booked as a time slot; or a different bath down the road that never asked, since city sento are often far more relaxed than resort hotels. Where a place is strict, the entrance says so: 入れ墨・タトゥーのある方はご遠慮ください.
| What you want to say | Say it like this | Japanese |
|---|---|---|
| I have a tattoo - am I able to use the bath? The one to ask before you pay for anything. | Tatuu ga aru no desu ga, nyuuyoku dekimasu ka. | タトゥーがあるのですが、入浴できますか。 |
| Is it okay if I cover it with a sticker? | Kabaa-shiiru o hareba daijoubu desu ka. | カバーシールを貼れば大丈夫ですか。 |
| Can I book the private bath? Kashikiri = booked for you alone. Common at ryokan, taken in a set time slot. | Kashikiri-buro no yoyaku wa dekimasu ka. | 貸切風呂の予約はできますか。 |
What do I say at the desk of a sento or a day-use onsen?
The talking is over inside a minute and half of it is pointing. At a sento you often speak to nobody: buy a ticket from the machine by the door, hand the stub over. At a ryokan opening its baths to outsiders, ask for higaeri nyuuyoku - day-use bathing - and they will give you the window, since day visitors are usually let in during the middle of the day, between the morning and evening baths of the guests staying over.
Brace for one sentence: many places swap the men's and women's baths on a schedule, so the curtain you used yesterday may be the other one today.
| What you want to say | Say it like this | Japanese |
|---|---|---|
| Do you allow day visitors for the bath? The exact phrase for using a ryokan's bath without staying the night. | Higaeri nyuuyoku wa dekimasu ka. | 日帰り入浴はできますか。 |
| Are shampoo and body soap provided? Usually yes at onsen, often no at old sento - that is what the vending machine by the door is for. | Shanpuu to bodisoopu wa arimasu ka. | シャンプーとボディソープはありますか。 |
| Do you sell towels? | Taoru wa utte imasu ka. | タオルは売っていますか。 |
| What time does the bath close? | O-furo wa nanji made desu ka. | お風呂は何時までですか。 |
What do the signs and curtains at a Japanese bath say?
The building tells you almost everything if you can read six characters. On the noren, the split curtain hanging over each door, colour is a hint rather than a rule - read the character.
- 男 men, 女 women. Also written 男湯 / 女湯, or 男性用 / 女性用.
- ゆ or 湯 hot water - the character on the curtain that means "bath, this way".
- 脱衣所 changing room. 洗い場 the washing area with the stools.
- 下駄箱 the shoe cupboard by the entrance. Shoes come off before you reach the desk.
- 貸切 private, booked. 水風呂 the cold plunge, which is exactly as cold as it looks.
- 入れ墨・タトゥーお断り no tattoos. 撮影禁止 no photography. 清掃中 being cleaned, come back later.
What actually annoys people in an onsen?
Short list, and none of it is about you being foreign. Soap carried into the tub. Loose long hair in the water. The small towel dipping in. Putting your head under. Swimming, splashing, or getting in with momentum. A shower head aimed sideways onto the person at the next station. Walking into the changing room dripping. Loud talk - the room has a hush and voices carry off wet tile.
Then the one that is not etiquette at all: taking a phone or a camera out once you are past the changing-room door is a serious matter rather than a faux pas, and is treated as one. It goes straight into the locker and stays there until you are dressed.
What nobody minds: being naked, being unsure, being visibly new to it, taking a long time, or sitting doing nothing. That last one is the actual point.
What if the water is too hot or I start to feel faint?
Japanese baths run hotter than visitors expect, and the word for what happens next is noboseru - light-headed, flushed, faintly unwell. It arrives faster on an empty stomach or after a drink, and the fix is boring: get out, sit on the edge, drink water, wait. Ten minutes in and ten out is a sane rhythm.
There is nearly always a fountain or a drinks machine in the changing room, and the regulars will tell you to drink before you go in as much as after.
| What you want to say | Say it like this | Japanese |
|---|---|---|
| It's a bit too hot for me. | Chotto atsusugimasu. | ちょっと熱すぎます。 |
| I feel a bit light-headed, so I'll rest for a minute. | Chotto nobosemashita node, sukoshi yasumimasu. | ちょっとのぼせましたので、少し休みます。 |
| Is there somewhere I can get a drink of water? | O-mizu ga nomeru tokoro wa arimasu ka. | お水が飲めるところはありますか。 |
What else is in PlaneHopper for this
Everything above is free to read and use. The full course adds 1 more scenario for these situations — each with the complete phrase set, every reply you might hear, and a 10-second roleplay that makes you produce the line under time pressure instead of just reading it.
♨️ Onsen & sentō etiquette
The two minutes of talking at the counter - shoes, ticket, towel, locker key, and the tattoo question - that all happen before you have taken off a single item of clothing.
- Otona futari onegai shimasu. 大人二人お願いします。
Two adults for the bath, please. - Kashi-taoru wa arimasu ka? 貸しタオルはありますか？
Can I rent a towel? (most sentō rent or sell them)
+10 more phrases, replies and a timed roleplay in PlaneHopper.
None of this is a test. Everyone in that room learned it by being taken there as a child, and nobody expects a visitor to arrive already knowing. Wash properly, keep the towel dry, leave the phone in the locker, and the rest is sitting in hot water with your eyes shut.
If somewhere turns you away over a tattoo it is not personal - there is usually another bath a few streets over.
Frequently asked questions
Do I really have to be completely naked in an onsen?
In the shared baths, yes. They are separated by gender and swimsuits are not allowed, because fabric carries detergent into water everyone shares. The exception is a handful of large resort spa complexes that have a separate swimsuit zone, and those advertise it clearly.
What is the difference between an onsen and a sento?
An onsen uses naturally occurring hot spring water and has to meet a legal standard to call itself one. A sento is a neighbourhood public bath with ordinary heated tap water, usually much cheaper and often much older. The etiquette is identical in both.
Can I use my phone in an onsen changing room?
No. Carry it in, put it in the locker with your clothes, and do not take it out again until you are dressed. Using a camera in a Japanese changing room is treated as a criminal matter rather than a rudeness, and there is no version of this where you get the benefit of the doubt.
Should I shower again after getting out of the onsen?
Usually people do not, at a real hot spring - leaving the minerals on your skin is part of the point. Some springs are strongly acidic or sulphurous and post a sign telling you to rinse. Follow the sign if there is one.
What do I do about long hair at an onsen?
Tie it up so it sits clear of the water, before you get in rather than after. Bring your own tie, since the changing room may or may not have them. The rule is simply that hair must not touch the bath.
Is it rude to talk in the bath?
Not at all, but keep it low. People talk quietly with the person next to them and the sound of the room stays soft. It is the volume, not the conversation, that stands out.