According to Unesco, the most translated author is Agatha Christie.
TOP 10 TRANSLATED AUTHORS
CHRISTIE, AGATHA |
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VERNE, JULES |
SHAKESPEARE, WILLIAM |
BLYTON, ENID |
LENIN, VLADIMIR IL’IC |
CARTLAND, BARBARA |
STEEL, DANIELLE |
ANDERSEN, HANS CHRISTIAN |
KING, STEPHEN |
GRIMM, JAKOB |
Source: Index Translationum database