類は友を呼ぶ (Rui wa tomo o yobu)

Meaning: People of the same kind are drawn to each other.

Literally: Like calls to like

Example: “彼の友達はみんな映画好きだ。類は友を呼ぶね。” — All his friends love movies: birds of a feather flock together.

Equivalents in English, French, Spanish, German, Italian, and 7 more languages

English: Birds of a feather flock together
French: Qui se ressemble s'assemble (literally: Those who resemble each other gather together)
Spanish: Dios los cría y ellos se juntan (literally: God raises them and they come together)
German: Gleich und gleich gesellt sich gern (literally: Like and like gladly keep company)
Italian: Chi si somiglia si piglia (literally: Those who are alike take to each other)
Portuguese: Cada qual com o seu igual (literally: Each one with his equal)
Dutch: Soort zoekt soort (literally: Kind seeks kind)
Russian: Рыбак рыбака видит издалека (Rybak rybaka vidit izdaleka) (literally: A fisherman spots a fisherman from afar)
Polish: Ciągnie swój do swego (literally: One's own draws to one's own)
Chinese: 物以类聚 (Wù yǐ lèi jù) (literally: Things gather by kind)
Korean: 가재는 게 편 (Gajaeneun ge pyeon) (literally: The crayfish sides with the crab)
Arabic: الطيور على أشكالها تقع (Aṭ-ṭuyūr ʿalā ashkālihā taqaʿ) (literally: Birds land with their own kind)