Onsen etiquette sounds intimidating before you do it. After your first time, you will wonder what the anxiety was about. The process is logical: get clean, then get in the hot water. Everything else follows from that.
Japanese onsen are gender-separated (men and women bathe in different areas) and clothing-free. No swimsuits, no towels in the water. This is the part that makes first-timers nervous, and it is also the part that stops mattering about 30 seconds after you get in.
The changing room
You enter the correct gender door (marked with kanji, colors, or icons: blue/male, red/female). Inside is a changing room with lockers or baskets. Undress completely. Store your clothes and belongings. Most onsen provide a small modesty towel (tenugui) and sometimes a larger bath towel. If not, bring your own.
Take only the small towel with you into the bathing area. Leave your large towel in the changing room for drying off when you return. Valuables go in the locker. Some lockers need a ¥100 coin (returned when you open it).
The washing station
Before you touch the bath water, you wash. This is not optional and it is the most important rule. Sit on the small stool at a shower station. Use the provided soap and shampoo (most onsen supply them) to wash your entire body and hair. Rinse thoroughly.
The logic: the bath is shared water. Everyone washes before entering so the water stays clean. Skipping this step is the single biggest breach of etiquette you can commit. Even if you showered at your hotel 20 minutes ago, wash again at the station.
Getting into the bath
Enter slowly. The water is hot, usually 39–42°C (102–108°F). Some baths are hotter. Your body needs a minute to adjust. Ease in rather than jumping.
The small towel goes on your head (folded on top) or on the edge of the bath. Never put it in the water. This is both etiquette and practical: keeping the towel out of the shared water keeps it clean.
Soak quietly. This is a relaxation space, not a swimming pool. No diving, no splashing, no loud conversations. Phones are absolutely not allowed in the bathing area (for obvious privacy reasons).
If there are multiple baths at different temperatures, try them in order from cooler to hotter. Many onsen have a mix of indoor baths, outdoor baths (rotenburo), cold plunge pools, and sometimes saunas. Move between them at your own pace.
When you are done
Some people rinse off after the bath, some do not. If the onsen has mineral-rich water (sulfur, iron, etc.), many locals skip the final rinse to let the minerals stay on their skin. Your choice.
Dry yourself as much as possible before walking back into the changing room. The floor in the changing area should stay dry. Use your large towel, get dressed, and you are done.
Tattoos
The tattoo situation is complicated. Many onsen prohibit tattoos because of the historical association between full-body tattoos and organized crime (yakuza). This is a cultural norm, not a legal rule, and it is enforced inconsistently.
The reality in 2026: some onsen are strict (signs at the door, staff checking), some look the other way for small foreign tattoos, and a growing number explicitly welcome tattooed visitors. What to do depends on your situation:
- Small tattoos: Tattoo cover stickers (available at drug stores and online) work at many onsen. Apply them before entering. Some onsen specifically state that covered tattoos are acceptable.
- Large tattoos or sleeves: Cover stickers will not work. Your best options are tattoo-friendly onsen, private baths (kashikiri), or the onsen at your ryokan during quiet hours when staff are less likely to enforce the policy.
- Private onsen (kashikiri): Many onsen and ryokan offer private baths you can reserve by the hour, usually for ¥2,000–5,000 per session. No one checks tattoos in a private bath because you are the only one in it.
Always check the policy before visiting. Call ahead, check the website, or ask your hotel staff. Getting turned away at the door is frustrating and avoidable with a quick check.
Mixed-gender onsen (konyoku)
Mixed-gender bathing exists but is increasingly rare. Most konyoku are in rural, traditional onsen areas. In practice, these are mostly frequented by older Japanese couples and families. Women typically wear a special bathing garment (yu-ami-gi) provided by the facility. Men are usually nude.
If the idea of mixed-gender nude bathing makes you uncomfortable, you almost certainly will not encounter it accidentally. Standard onsen are gender-separated, and you have to seek out konyoku specifically.
Private onsen (kashikiri)
Private baths solve most onsen anxieties at once. Tattoos, shyness, wanting to bathe with your partner regardless of gender. You reserve a bath for a set time (usually 30–60 minutes), and it is yours alone.
Most ryokan in onsen towns offer kashikiri. Some include it free for guests. Others charge ¥2,000–5,000 per session. Quality varies: some are beautiful outdoor stone baths, others are small indoor tubs. Ask to see photos before booking.
Some higher-end ryokan rooms come with their own private rotenburo (outdoor bath) on the balcony or terrace. These cost more per night but give you unlimited private onsen access without reservations.
Outdoor vs. indoor baths
Rotenburo (outdoor baths) are the highlight of any onsen experience. Soaking in hot mineral water while looking at mountains, forests, or falling snow is genuinely one of the best things you can do in Japan.
Indoor baths are often hotter and more controlled. They are the practical option when weather is bad or when the outdoor bath is too cold to walk to.
The best onsen have both. Start indoors to warm up, then move outside. In winter, the contrast between cold air and hot water makes the outdoor bath exceptional. Kinosaki and Noboribetsu are particularly good for this.
Onsen at your ryokan vs. public baths
If you are staying at a ryokan with its own onsen, you can bathe anytime (usually except during cleaning hours, typically early morning). The baths are smaller, less crowded, and you share them only with other hotel guests. This is the gentlest introduction to onsen bathing.
Public onsen (day-use facilities) are larger, busier, and cost ¥500–2,000 for entry. They often have more variety: multiple bath types, saunas, cold plunges, and rest areas. The trade-off is more people.
Sento (neighborhood public bathhouses) use regular heated water instead of natural spring water. The etiquette is identical. Sento are cheaper (around ¥550 in Tokyo), found in cities, and an easy way to practice onsen etiquette without traveling to an onsen town.
The anxiety is normal
Almost every first-timer is nervous about being naked in front of strangers. This is universal. It does not matter where you are from or how comfortable you are with your body. The unfamiliarity of the situation creates anxiety.
Here is what actually happens: you walk in, nobody looks at you, you wash, you get in the water, and within two minutes you forget you are naked. Everyone else is naked too. The water is opaque in many mineral baths, so you cannot see much below the surface. And the Japanese bathers around you are there to relax, not to examine foreign visitors.
If you are truly uncomfortable, go at off-peak hours (early morning or late evening when baths are nearly empty) or use a private bath for your first experience. But the overwhelming consensus from first-timers: the anxiety evaporates the moment you get in the water.
What NOT to do
- Do not skip washing. This is the cardinal rule. Wash before you soak.
- Do not put your towel in the water. On your head or at the edge. Never in the bath.
- Do not swim or splash. Onsen are for soaking, not swimming.
- Do not bring your phone. No photos, no calls, no exceptions.
- Do not stare. Everyone is naked. Keep your eyes to yourself.
- Do not walk into the bath area with shoes or slippers. These stay in the changing room or the designated shoe area.
- Do not go if you are visibly drunk. Most onsen prohibit this, and hot water plus alcohol is a genuine health risk.
- Do not drain the bath or adjust water temperature unless it is a private bath and you have been told you can.