Japan Onsen Etiquette Guide: Rules, What to Wear, and How to Behave

An onsen (温泉) is a hot spring bath fed by geothermally heated water containing certified mineral compounds. Japan has over 3,000 certified onsen towns, from small rural villages with a single inn to major resort destinations like Hakone, Beppu, and Noboribetsu.

Japanese onsen water is categorized by its mineral composition: simple thermal, bicarbonate, sulfate, chloride, iron, sulfur, radium, and others. Each type has different properties and traditional therapeutic benefits.

Onsen typically appear in two settings:

• Ryokan (旅館): Traditional Japanese inn with private and communal onsen. Usually includes dinner and breakfast. The quintessential onsen experience.
• Day-use public baths (日帰り温泉 / higaeri onsen): Pay per entry (¥500–¥1,500). No overnight stay required. Many have excellent facilities including multiple pool types, saunas, and restaurant areas.

1. Rinse thoroughly before entering any tub

   This is the most important rule. Use the shower stations at the edge of the bathing area to wash your entire body with soap and shampoo before entering the communal pools. This keeps the mineral water clean for everyone.

2. No swimwear in traditional onsen

   Onsen are used completely unclothed. Swimsuits are not permitted in traditional onsen. Some modern "mixed-gender" onsen (konyoku) allow swimwear or provide a covering, but check the specific facility's policy.

3. Tie up long hair

   Long hair must be tied up or pinned so it does not touch the bath water. Rubber bands are usually available at the bathing area entrance.

4. Small towel only in the bath area

   Bring only your small towel (provided by most ryokan). Place it folded on your head or on the edge of the tub — never in the bath water.

5. No cameras or smartphones

   Strictly forbidden. Do not bring your phone or camera to the bath area. Photographing the baths or other guests is a serious violation of privacy.

6. Don't drain the water out of the bath

   Don't let your towel trail in or soak up the bath water. The water circulates continuously and is shared by all guests.

7. Don't wear bandages or plasters into the tub

   Wounds or bandaged areas should be covered with a waterproof patch or the guest should refrain from using the bath. Open wounds should not enter onsen.

Japan's traditional onsen tattoo ban is one of the most frequently asked questions by international travelers. Here's the current reality:

Why the ban exists: Historically, tattoos in Japan were associated with yakuza (organized crime). Many onsen ban tattoos to maintain a family-friendly environment and avoid the historical association, even though this tradition is outdated for international visitors.

Options for tattooed travelers:

• Check before booking: Many modern ryokan and day spas now welcome tattooed guests. Explicitly state "tattoo-friendly" or "tattoos ok" (タトゥー可) — look for this when booking.
• Private baths (貸し切り風呂 / kashikiri buro): Many ryokan offer private family or couple baths that can be reserved for 30–60 minutes. Tattoos are typically permitted in private baths regardless of main bath policy.
• Skin cover patches: Some onsen allow tattooed guests to cover tattoos with waterproof patches. Ask the facility before arriving.
• Tattoo-friendly facilities: Some newer super sento and resort spas explicitly welcome guests with tattoos. Search Google Maps or booking sites with the filter for tattoo-ok.

• Rotenburo (露天風呂) / Outdoor bath: The most beloved onsen experience. Open-air baths with views of mountains, forests, or gardens. Soaking in a mountain rotenburo in the snow is quintessential Japan.
• Uchiyoku (内浴) / Indoor bath: Enclosed indoor pools. Better for privacy and year-round comfort regardless of weather.
• Kashikiri buro (貸し切り風呂) / Private bath: A private onsen room or bath that you reserve for just your group. Great for couples, families, or tattooed guests. Usually bookable for 30–60 minutes at an extra charge (¥1,000–¥3,000).
• Mixed-gender (混浴 / konyoku): Increasingly rare in modern Japan. Traditionally allowed men and women to bathe together. Many have adopted swimwear-required policies or converted to separate bathing.
• Foot bath (足湯 / ashiyu): Public foot baths found near train stations and in town centers of onsen resorts. Free or very cheap (¥100–¥300). No undressing required — just roll up your pants. A great way to experience onsen water without full commitment.

At a ryokan, almost everything is provided. For day-use onsen:

• Small towel: Bring or rent (¥100–¥200). Used in the bath area and for drying.
• Large bath towel: For after bathing. Provided at ryokan, rental available at day-use facilities.
• Soap, shampoo, conditioner: Provided at most onsen. Some day-use facilities have dispensers; some sell individual packs.
• Hair tie: Essential if you have long hair.
• Yukata or clothes to relax in: Ryokan provide yukata for after-bath lounging.
• Coin for locker: Many onsen have coin-operated lockers (usually ¥100 returned when you leave).

• Hakone (Kanagawa): Day-trip distance from Tokyo. Views of Mt. Fuji. Multiple hot spring types. Excellent ryokan scene.
• Beppu (Oita, Kyushu): Japan's most diverse onsen town — eight different spring types including the famous "Hells" (jigoku). Something for every preference.
• Noboribetsu (Hokkaido): Japan's most famous therapeutic onsen town. Nine spring types within a few blocks. "Hell Valley" volcanic landscape nearby.
• Kinosaki Onsen (Hyogo): A traditional onsen town where guests wear yukata and walk between seven public bathhouses — a unique "town-bathing" experience.
• Kusatsu (Gunma): Famous for its extremely acidic sulfur spring (pH 2) and the "yumomi" ritual of cooling the water with wooden paddles.
• Arima Onsen (Hyogo): Near Kobe. Japan's oldest recorded onsen. Two types: "golden water" (iron-rich brown) and "silver water" (radium carbonate).