| Country | Date | |
|---|---|---|
| USA | 4 October 1969 | (New Orleans, Louisiana) (premiere) |
| UK | 12 October 1969 | |
| Japan | 25 October 1969 | |
| France | 31 October 1969 | |
| West Germany | 7 November 1969 | |
| Austria | 21 November 1969 | |
| USA | 27 November 1969 | |
| Italy | 4 December 1969 | |
| Sweden | 19 December 1969 | |
| Denmark | 5 January 1970 | |
| Hong Kong | 29 January 1970 | |
| Norway | 30 March 1970 | |
| Finland | 24 April 1970 | |
| Mexico | 6 September 1970 | |
| Turkey | February 1971 |
| Die Unbesiegten | Austria / West Germany |
| A legyőzhetetlen | Hungary |
| Batinin devleri | Turkey (Turkish title) |
| De obesegrade | Sweden |
| De ubesejrede | Denmark |
| El dúo invencible | Venezuela |
| I due invincibili | Italy |
| Jamais Foram Vencidos | Brazil (imdb display title) |
| Les géants de l'Ouest | France |
| Los indestructibles | Spain |
| Los invencibles | Mexico |
| Nepobedivi | Yugoslavia (literal title) (Serbian title) |
| Niezwyciezeni | Poland |
| Nunca Foram Vencidos | Portugal |
| Oi aittitoi | Greece (transliterated ISO-LATIN-1 title) |
| Voittamattomat | Finland |
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