Japanese Onsen Language Guide: Key Words and Phrases for Hot Spring Visits

A functional onsen vocabulary in Japanese takes less than an hour to learn and pays dividends throughout a Japan trip — for reading bath signs, understanding what type of spring you're in, asking the right questions at check-in, and communicating with ryokans that don't have English-speaking staff.

Essential Onsen Vocabulary

Bath Types

Japanese	Romanization	Meaning
温泉	Onsen	Natural hot spring
銭湯	Sentō	Public bathhouse (tap water)
露天風呂	Rotenburo	Outdoor bath
内湯	Naiyu	Indoor bath
大浴場	Daiyokujō	Large communal bath hall
貸切風呂	Kashikiri buro	Private reserved bath
部屋付き露天風呂	Heya-tsuki rotenburo	Room-attached private outdoor bath
混浴	Konyoku	Mixed-gender bathing

Gender Signs

Japanese	Romanization	Meaning
男	Otoko	Men
女	Onna	Women
男湯	Otoko-yu	Men's bath
女湯	Onna-yu	Women's bath

Visual cues: Men's bath is typically marked with blue noren curtain (暖簾); women's bath with red. The kanji 男 (three horizontal strokes with a curved stroke below) vs 女 (a three-stroke character resembling a seated figure) — memorize these two characters above all others.

Spring Types (Visible on Property Signs)

Japanese	Romanization	Type
単純温泉	Tanjun onsen	Simple thermal (general)
硫黄泉	Iō-sen	Sulfur spring (milky white)
食塩泉	Shokuen-sen	Salt spring (sodium chloride)
重曹泉	Jūsō-sen	Sodium bicarbonate (beauty spring)
酸性泉	Sansei-sen	Acidic spring
鉄泉	Tetsu-sen	Iron spring (orange-brown)
炭酸泉	Tansan-sen	Carbon dioxide spring (effervescent)
かけ流し	Kakenaganshi	Free-flowing (not recirculated) — the preferred type
循環式	Junkan-shiki	Recirculated spring water

At Check-In

Phrase	Romanization	Meaning
よろしくお願いします	Yoroshiku onegaishimasu	Standard polite greeting/thank you (used constantly)
何時から入れますか?	Nanji kara hairemasu ka?	From what time can I use the bath?
何時まで入れますか?	Nanji made hairemasu ka?	Until what time can I use the bath?
貸切風呂は予約できますか?	Kashikiri buro wa yoyaku dekimasu ka?	Can I reserve a private bath?
夕食は何時ですか?	Yūshoku wa nanji desu ka?	What time is dinner?
朝食は何時ですか?	Chōshoku wa nanji desu ka?	What time is breakfast?
館内着はどこですか?	Kan'nai gi wa doko desu ka?	Where are the yukata (in-house robes)?

At the Bath

Japanese	Romanization	Meaning
洗い場	Araiba	Shower/washing area (use before entering bath)
かけ湯	Kakeyu	Rinsing with a ladle before entering (traditional)
タオル	Taoru	Towel
石鹸	Sekken	Soap
シャンプー	Shanpū	Shampoo
持ち込み禁止	Mochikomi kinshi	No bringing in [usually refers to food/drinks]
撮影禁止	Satsuei kinshi	No photography
水風呂	Mizu buro	Cold plunge bath
サウナ	Sauna	Sauna

Useful Phrases for Specific Situations

Tattoo inquiry

• Do you allow tattoos? → Tattoo wa daijōbu desu ka? (タトゥーは大丈夫ですか?)
• I have a small tattoo → Chīsai tattoo ga arimasu (小さいタトゥーがあります)

Dietary needs at dinner

• I don't eat meat → Niku wa taberaremasen (肉は食べられません)
• I don't eat fish → Sakana wa taberaremasen (魚は食べられません)
• I'm vegetarian → Bejitarian desu (ベジタリアンです)
• I'm allergic to [item] → [Item] ni arerugī ga arimasu ([アイテム]にアレルギーがあります)

Getting help

• Excuse me → Sumimasen (すみません) — the most useful word in Japan
• I don't understand → Wakarimasen (わかりません)
• Do you speak English? → Eigo ga hanasemasu ka? (英語が話せますか?)
• Please write it down → Kaite itadakemasu ka? (書いていただけますか?)

Signs to Know

入浴禁止 (Nyūyoku kinshi): No bathing — area closed.

準備中 (Junbichū): Preparing — bath not yet open.

男女入れ替え (Dan-jo irekae): Men's and women's baths swap — many ryokans rotate which communal bath is male/female so guests experience both. Check the timing at check-in.

源泉掛け流し (Gensen kake-nagashi): Free-flowing natural spring water, not recirculated — this is printed prominently on signs at properties that use this system as a quality marker.

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Related guides:

→ Onsen Rules for Foreigners → Ryokan Check-In Guide → First Time Ryokan Tips → Hot Spring Types Guide