| Language | Name | Code |
|---|---|---|
| Afrikaans | Heidelberg, Duitsland | af |
| Amharic | ሃይደልበርግ | am |
| Aragonese | Heidelberg | an |
| Arabic | هيدلبرغ | ar |
| arz | هايديلبيرج | arz |
| Asturian | Heidelberg | ast |
| Azerbaijani | Heydelberq | az |
| azb | هایدلبرق | azb |
| ban | Heidelberg | ban |
| Bavarian | Heidlberg | bar |
| Belarusian | Гайдэльберг | be |
| be-tarask | Гайдэльбэрг | be-tarask |
| Bulgarian | Хайделберг | bg |
| Bengali | হাইডেলবার্গ | bn |
| Breton | Heidelberg | br |
| Bosnian | Heidelberg | bs |
| Catalan | Heidelberg | ca |
| Chechen | Хайдельберг | ce |
| Cebuano | Heidelberg | ceb |
| Central Kurdish | ھایدلبێرگ | ckb |
| Corsican | Heidelberg | co |
| Czech | Heidelberg | cs |
| csb | Heidelberg | csb |
| Chuvash | Гейдельберг | cv |
| Welsh | Heidelberg | cy |
| Danish | Heidelberg | da |
| German | Heidelberg | de |
| diq | Heidelberg | diq |
| dsb | Heidelberg | dsb |
| Modern Greek (1453-) | Χαϊδελβέργη | el |
| English | Heidelberg | en |
| en-ca | Heidelberg | en-ca |
| en-gb | Heidelberg | en-gb |
| Esperanto | Heidelberg | eo |
| Spanish | Heidelberg | es |
| Estonian | Heidelberg | et |
| Basque | Heidelberg | eu |
| Persian | هایدلبرگ | fa |
| Finnish | Heidelberg | fi |
| French | Heidelberg | fr |
| frr | Heidelberg | frr |
| Western Frisian | Heidelberch | fy |
| Irish | Heidelberg | ga |
| Scottish Gaelic | Heidelberg | gd |
| Galician | Heidelberg | gl |
| gsw | Heidelbärg | gsw |
| Gujarati | હાઈડલબર્ગ | gu |
| hak | Heidelberg | hak |
| Hebrew | היידלברג | he |
| Hindi | हीडलबर्ग | hi |
| Croatian | Heidelberg | hr |
| Upper Sorbian | Heidelberg | hsb |
| Hungarian | Heidelberg | hu |
| Armenian | Հայդելբերգ | hy |
| Interlingua (International Auxiliary Language Association) | Heidelberg | ia |
| Indonesian | Heidelberg | id |
| Interlingue | Heidelberg | ie |
| Ido | Heidelberg | io |
| Icelandic | Heidelberg | is |
| Italian | Heidelberg | it |
| Japanese | ハイデルベルク | ja |
| Georgian | ჰაიდელბერგი | ka |
| Kazakh | Гейдельберг | kk |
| Kannada | ಹೈಡೆಲ್ಬರ್ಗ್ | kn |
| Korean | 하이델베르크 | ko |
| Kurdish | Heidelberg | ku |
| Kirghiz | Хайдельберг | ky |
| Latin | Heidelberga | la |
| Luxembourgish | Heidelberg | lb |
| Limburgan | Heidelberg | li |
| lld | Heidelberg | lld |
| lmo | Heidelberg | lmo |
| Lithuanian | Heidelbergas | lt |
| Latvian | Heidelberga | lv |
| Malagasy | Heidelberg | mg |
| Macedonian | Хајделберг | mk |
| Malayalam | ഹൈഡൽബർഗ് | ml |
| Marathi | हायडेलबर्ग | mr |
| Malay (macrolanguage) | Heidelberg | ms |
| Maltese | Heidelberg | mt |
| nah | Heidelberg | nah |
| nan | Heidelberg | nan |
| Norwegian Bokmål | Heidelberg | nb |
| Low German | Heidelbarg | nds |
| Dutch | Heidelberg | nl |
| Norwegian Nynorsk | Heidelberg | nn |
| Chichewa | Heidelberg | ny |
| Occitan (post 1500) | Heidelberg | oc |
| Ossetian | Гейдельберг | os |
| pdc | Heidelberg | pdc |
| pfl | Haidlbärsch | pfl |
| Polish | Heidelberg | pl |
| pms | Heidelberg | pms |
| pnb | ہائیڈلبرگ | pnb |
| Portuguese | Heidelberg | pt |
| pt-br | Heidelberg | pt-br |
| Quechua | Heidelberg | qu |
| Romansh | Heidelberg | rm |
| Romanian | Heidelberg | ro |
| Russian | Гейдельберг | ru |
| rup | Heidelberg | rup |
| sah | Гейдельберг | sah |
| Sicilian | Heidelberg | scn |
| Scots | Heidelberg | sco |
| sh | Heidelberg | sh |
| Sinhala | හෙඩ්ල්බර්ග් | si |
| Slovak | Heidelberg | sk |
| Slovenian | Heidelberg | sl |
| Albanian | Haidelbergu | sq |
| Serbian | Хајделберг | sr |
| stq | Heidelberg | stq |
| Swedish | Heidelberg | sv |
| Swahili (macrolanguage) | Heidelberg | sw |
| szl | Heidelberg | szl |
| Tamil | ஹைடெல்பர்க் | ta |
| Telugu | హైడెల్బర్గ్ | te |
| Tajik | Ҳайделберг | tg |
| Thai | ไฮเดิลแบร์ค | th |
| Turkish | Heidelberg | tr |
| Tatar | Һайделберг | tt |
| tum | Heidelberg | tum |
| Uighur | Héydélbérg | ug |
| Ukrainian | Гайдельберг | uk |
| Urdu | ہائیڈل برگ | ur |
| Uzbek | Heidelberg | uz |
| vec | Heidelberg | vec |
| Vietnamese | Heidelberg | vi |
| vls | Heidelberg | vls |
| Volapük | Heidelberg | vo |
| war | Heidelberg | war |
| Wu Chinese | 海德堡 | wuu |
| Yiddish | היידלבערג | yi |
| Yoruba | Heidelberg | yo |
| yue | 海德堡 | yue |
| Chinese | 海德堡 | zh |
| zh-hans | 海德堡 | zh-hans |
| zh-hant | 海德堡 | zh-hant |