| Country | Date | |
|---|---|---|
| UK | 28 September 1955 | |
| Denmark | 7 October 1955 | |
| Japan | 1 November 1955 | |
| Sweden | 16 April 1956 | |
| West Germany | 11 May 1956 | |
| USA | June 1956 | |
| Finland | 23 June 1994 | (TV premiere) |
| Monstre, Le | Belgium (French title) / France |
| Xperiment Q | Denmark / Sweden |
| Astronave atomica del dottor Quatermass | Italy |
| Experimento del Dr. Quatermass, El | Spain |
| Monstro do Espaço, O | Portugal |
| Quatermass | Finland |
| Schock | West Germany |
| Shock | (undefined) |
| The Creeping Unknown | USA |
| The Quatermass Experiment | USA |
| X the Experiment | UK (informal alternative title) |
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