| 三つ | みっつ | three; three years of age | n5 |
| 三月 | さんがつ | March; third month of the lunar calendar | n5 |
| 三 | さん | three; 3 | n5 |
| 三味線 | しゃみせん | shamisen; samisen; three-stringed Japanese lute | |
| 三郎 | さぶろう | third son; Occella iburia (species of poacher) | |
| 三角 | さんかく | triangle; triangular shape | n1 |
| 第三者 | だいさんしゃ | third party; third person; outsider; disinterested person | n1 |
| 三河 | みかわ | Mikawa (former province located in the east of present-day Aichi Prefecture) | |
| 三昧 | さんまい | samadhi (state of intense concentration achieved through meditation); being immersed in; being absorbed in; indulging in | |
| 再三 | さいさん | again and again; repeatedly | n2 |
| 三重 | さんじゅう | triple; treble; threefold; three-ply | |
| 三男 | さんなん | three sons; third son | |
| 三角形 | さんかくけい | triangle | |
| 三菱 | みつびし | Mitsubishi | |
| 三越 | さんえつ | San'etsu (the three former provinces of Echizen, Etchū and Echigo) | |
| 三人 | さんにん | three people | |
| 三日月 | みかづき | crescent moon; young moon | n1 |
| 三種 | さんしゅ | three kinds; three varieties | |
| 二三 | にさん | two or three | |
| 三重県 | みえけん | Mie Prefecture (Kinki area) | |
| 三重縣 | みえけん | Mie Prefecture (Kinki area) | |
| 三味 | さみ | three-stringed guitar | |
| 三面 | さんめん | three sides; three faces; page three (of a newspaper) | |
| 一三 | じゅうさん | thirteen; 13; king | |
| 三宝 | さんぼう | the Three Jewels; the Triple Gem; Triratna; the Three Treasures | |
| 三都 | さんと | three large cities (esp. Edo, Kyoto, and Osaka during the Edo period) | |
| 三文 | さんもん | paltry amount of money; cheapness; worthlessness; three one-mon coins | |
| 三界 | さんがい | the three realms of existence; the whole universe (of a billion worlds) that Buddha enlightened; past, present and future existences; far-off ... | |
| 三脚 | さんきゃく | tripod; three legs | n1 |
| 三々五々 | さんさんごご | in groups of twos and threes; in small groups; (in groups of) threes and fives | |
| 三流 | さんりゅう | third-rate; third-class | |
| 三方 | さんぼう | three sides; small offering stand | |
| 無二無三 | むにむさん | in earnest; single-minded; with intense concentration; rushing headlong into | |
| 三日 | みっか | 3rd day of the month; three days | n5 |
| 三絃 | さんげん | shamisen; samisen; sanxian (Chinese lute); the three string instruments used in gagaku (biwa, wagon and sou) | |
| 三番 | さんばん | third; no. three | |
| 三時 | さんじ | 3 o'clock; afternoon snack (eaten around 3 o'clock); three ages of Buddhism (following the death of Gautama Buddha; age of the true law, age of the copied law, and age of the degeneration of the law); three ages of the dharma | |
| 三国志 | さんごくし | Records of the Three Kingdoms (Chinese historical text) | |
| 三軍 | さんぐん | great army; mighty host; whole army | |
| 三線 | さんしん | sanshin; Okinawan traditional three-stringed instrument; precursor to the shamisen | |
| 三陸 | さんりく | Sanriku (the three former provinces of Rikuzen, Rikuchū and Rikuō) | |
| 三年 | さんねん | three years; third school year (e.g. of high school) | |
| 三叉 | みつまた | three-pronged; three-way (e.g. outlet, intersection); trifurcated; three-pronged fork | |
| 三馬 | さんま | Pacific saury (Cololabis saira); mackerel pike | |
| 三更 | さんこう | third watch of the night (approx. 11pm to 1am) | n3 |
| 三拍子 | さんびょうし | triple time; triple meter; triple metre; three-four time | |
| 三枚目 | さんまいめ | comedian; actor who plays comic roles; figure of fun; laughing stock | |
| 三助 | さんすけ | male bathhouse attendant | |
| 御三家 | ごさんけ | three branches of the Tokugawa family (Owari, Kii and Mito); big three; top three | |
| 三次 | さんじ | third; tertiary; cubic (function, equation, etc.); third-order | |
| 三蔵 | さんぞう | three branches of Buddhist sutras | |
| 三一 | さんぴん | low-ranking samurai; rolling three and one (in a dice game) | |
| 三下 | さんした | petty underling; small fry | |
| 三度 | さんど | three times; thrice; third (interval) | |
| 三省堂 | さんせいどう | Sanseido (publisher) | |
| 三位一体 | さんみいったい | the Trinity; three parts; three components; three factors | |
| 南無三宝 | なむさんぼう | Homage to the Three Jewels (Buddha, Dharma and Sangha); oh no!; good heavens!; oops | |
| 三十一文字 | みそひともじ | tanka; 31-mora Japanese poem | |
| 三白眼 | さんぱくがん | sanpaku eyes (eyes with visible white between the iris and the lower eyelid) | |
| 三山 | さんざん | three mountains; three shrines (of Kumano); three kingdoms (of 14th and 15th-century Okinawa) | n1 |
| 三寸 | さんずん | three sun (ca. 9.1 cm); something small, short or thin (roughly the size of three sun); stall-keeper; huckster | |
| 三輪 | さんりん | three wheels | n1 |
| 二三日 | にじゅうさんにち | 23rd day of the month; 23 days | |
| 三途の川 | さんずのかわ | Sanzu River (Japanese Buddhist equivalent of the River Styx); River of Three Crossings | |
| 二束三文 | にそくさんもん | dirt cheap; very cheap | |
| 三唱 | さんしょう | three cheers; three chants; singing three times | |
| 三拝九拝 | さんぱいきゅうはい | kowtowing; bowing repeatedly; three kneelings and nine prostrations; my deepest respects | |
| 三門 | さんもん | large triple gate to temple | |
| 三春 | さんしゅん | three spring months | |
| 三々九度 | さんさんくど | three-times-three exchange of nuptial cups | |
| 三振 | さんしん | strikeout | |
| 三枚 | さんまい | three flat objects (sheets of paper, pieces of cloth, etc.); cutting a fish into two boneless fillets and a piece with the skeleton | |
| 七五三 | しちごさん | shichi-go-san; 7-5-3 day; festival day for children aged 7, 5 and 3 held on or around November 15; lucky numbers 7, 5 and 3 | |
| 三国 | さんごく | three countries; Three Kingdoms (in China, 220 CE-280 CE); Three Kingdoms (in Korea, 57 BCE-668 CE); Japan, China and India | |
| 三人称 | さんにんしょう | third person; third-person reference term; term used to refer to someone or something in the third person | |
| 三公 | さんこう | three lords (highest ranking officials in the old Imperial Chinese or Japanese governments) | n3 |
| 三段 | さんだん | third stage; three stages; third dan (in martial arts, go, shogi, etc.) | |
| 三毛 | みけ | calico (pattern); tortoiseshell-and-white; calico cat; tortoiseshell-and-white cat | |
| 七三 | しちさん | seven-to-three ratio; 70-30 split; 70-30 hair part; hairstyle with hair parted in a 70-30 ratio | |
| 三部 | さんぶ | three parts; three copies | |
| 十三夜 | じゅうさんや | 13th day (of the moon); the night of the 13th day of 9th lunar month | |
| 三光 | さんこう | the Sun, the Moon and the stars; three 20-point cards (high-scoring meld) | n3 |
| 三本 | さんぼん | three (long cylindrical things); three-of-a-kind (in a dealt hand) | |
| 三塁打 | さんるいだ | three-base hit; triple | |
| 胸三寸 | むねさんずん | heart; mind; feelings | |
| 三段論法 | さんだんろんぽう | syllogism | |
| 口三味線 | くちじゃみせん | humming a samisen tune; smooth talk; sweet words; cajolery | |
| 三舎 | さんしゃ | three days' march (approx. 36.5 km) | |
| 三つ指 | みつゆび | placing three fingers of each hand on the floor (while bowing respectfully); three fingers (specifically the thumb, index finger and middle finger) | |
| 三つ葉 | みつば | mitsuba (Cryptotaenia japonica); Japanese honewort; Japanese honeywort; Japanese chervil | |
| 三塁 | さんるい | third base | |
| 三徳 | さんとく | three cardinal virtues (wisdom, benevolence and valour (valor)); (having) three uses (e.g. a kitchen knife); (having) three advantages (e.g. a method); three qualities of nirvana (dharmakaya, prajna and moksha) | |
| 三輪車 | さんりんしゃ | three wheeled vehicle (tricycle, motorcycle, etc.); three wheeler | |
| 再三再四 | さいさんさいし | repeatedly | |
| 三国一 | さんごくいち | unparalleled in Japan, China and India | |
| 三嘆 | さんたん | deep admiration; repeatedly lamenting | |
| 三歎 | さんたん | deep admiration; repeatedly lamenting | |
| 三筋 | みすじ | misuji (cut of beef, usu. from the chuck); shamisen; samisen | |
| 三ヶ日 | さんがにち | first three days of the New Year (January 1-3) | |
| 三幅対 | さんぷくつい | set of three | |