- Afrikaans: reaksie
- Albanian: reagim (sq) m
- Arabic: رَدّ فِعْل m (radd fiʕl), تَفَاعُل m (tafāʕul)
- Armenian: ռեակցիա (hy) (ṙeakcʻia)
- Azerbaijani: reaksiya, əksüləməl, təpki
- Belarusian: рэа́кцыя f (reákcyja)
- Bengali: প্রতিক্রিয়া (bn) (protikriẏa)
- Bulgarian: реа́кция (bg) f (reákcija)
- Catalan: reacció (ca) f
- Chinese:
- Mandarin: 反應/反应 (zh) (fǎnyìng), (political) 反動/反动 (zh) (fǎndòng)
- Czech: reakce (cs) f
- Danish: reaktion (da) c
- Dutch: reactie (nl) f
- Esperanto: reakcio, reago
- Estonian: reaktsioon
- Finnish: reaktio (fi), vaikutus (fi), vastavaikutus (fi), vaste (fi) (medicine)
- French: réaction (fr) f
- Galician: reacción (gl) f
- Georgian: რეაქცია (reakcia)
- German: Reaktion (de) f
- Greek: αντίδραση (el) f (antídrasi)
- Hebrew: תְּגוּבָה (he) f (t'guvá)
- Hindi: प्रतिक्रिया (hi) f (pratikriyā), प्रक्रिया (hi) f (prakriyā)
- Hungarian: reakció (hu)
- Indonesian: reaksi (id)
- Irish: frithghníomhaíocht f
- Italian: reazione (it) f
- Japanese: 反応 (ja) (はんのう, hannō), (political) 反動 (ja) (はんどう, handō)
- Kazakh: реакция (reaksiä)
- Khmer: ប្រតិកម្ម (km) (praʼtekam)
- Korean: 반응(反應) (ko) (baneung), (political) 반동(反動) (ko) (bandong)
- Kyrgyz: реакция (ky) (reaktsiya)
- Lao: ປະຕິກິລິຍາ (pa ti ki li nyā), ປະຕິກິຣິຍາ (pa ti ki ri nyā)
- Latin: reāctiō f (Medieval or New Latin)
- Latvian: reakcija f
- Lithuanian: reakcija (lt) f
- Luxembourgish: Reaktioun f
- Macedonian: реакција f (reakcija)
- Malay: reaksi, tindak balas (ms)
- Maltese: reazzjoni f
- Marathi: प्रतिक्रिया (mr) f (pratikriyā)
- Mongolian:
- Cyrillic: урвал (mn) (urval)
- Norwegian:
- Bokmål: reaksjon (no) m
- Nynorsk: reaksjon m
- Persian: واکنش (fa) (vâkoneš), رآکسیون (re-âksyon)
- Polish: reakcja (pl) f
- Portuguese: reação (pt) f
- Romanian: reacție (ro) f
- Russian: реа́кция (ru) f (reákcija)
- Sanskrit: प्रतिक्रिया (sa) f (pratikriyā), प्रक्रिया (sa) f (prakriyā)
- Serbo-Croatian:
- Cyrillic: реа̀кција f
- Roman: reàkcija (sh) f
- Slovak: reakcia f
- Slovene: reakcija f
- Spanish: reacción (es) f
- Swahili: mmenyuko
- Swedish: reaktion (sv) c
- Tagalog: reaksyon
- Tajik: таассур (taassur), реаксия (reaksiya), вокуниш (vokuniš)
- Telugu: ప్రతిచర్య (praticarya), ప్రతిక్రియ (te) (pratikriya)
- Thai: ปฏิกิริยา (th) (bpà-dtì-gì-rí-yaa)
- Turkish: tepki (tr), reaksiyon (tr)
- Turkmen: reaksiýa
- Ukrainian: реа́кція f (reákcija)
- Uzbek: reaksiya (uz), sezish (uz)
- Vietnamese: phản ứng (vi) (反應)
- Welsh: adwaith (cy) m,ymateb (cy) m
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