United Kingdom
London detectives investigate crimes from the past, unravelling secrets left buried for years. - IMDb
| The Forgotten | United Kingdom |
| Inesquecível |  Portugal |
| Kihantolt bűnök |  Hungary |
| Minkä taakseen jättää |  Finland |
| Nedgravde hemmeligheter |  Norway |
| Niezapomniane |  Poland |
| Saknad, aldrig glömd |  Sweden |
| Uforglemt |  Denmark |
| Uforglemt: Mordet på Hayley Reid (third season title) | Denmark |
| Unforgotten |  Canada |
| Unforgotten | Canada |
| Unforgotten |  West Germany |
| Unforgotten |  Spain |
| Unforgotten | United Kingdom |
| Unforgotten |  Ireland |
| Unforgotten |  India |
| Unforgotten | India |
| Unforgotten |  Italy |
| Unforgotten |  Japan |
| Unforgotten |  Mexico |
| Unforgotten |  Netherlands |
| Unforgotten |  New Zealand |
| Unforgotten |  Philippines |
| Unforgotten |  Singapore |
| Unforgotten |  United Arab Emirates |
| Unforgotten |  Turkey |
| Unforgotten |  USA |
| Unforgotten |  South Africa |
| Unforgotten |  Australia |
| Unforgotten |  Brazil |
| Unforgotten: Le Passé déterré |  France |
| Unustamatu (complete title) |  Estonia |
| Unutilmas |  Uzbekistan |
| Незабравени |  Bulgaria |
| Незабытый |  Kazakhstan |
| Незабытый |  Russia |
| Ұмытылмаған | Kazakhstan |
| 埋もれる殺意 | Japan |
| 遺骨懸案 |  Taiwan |
| 언포가튼 |  South Korea |
| １８年後の慟哭 (third season title) | Japan |
| ２６年の沈黙 (second season title) | Japan |
| ３９年目の真実 (first season title) | Japan |
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Yusuf Hofri | Mustafa |
