Doubtful
Doubtful (English for doubtful ) stands for:
- Doubtful Bay , South Georgia Bay in the South Atlantic
- Doubtful Crumbs , title of a painting by the British painter Edwin Henry Landseer (1802–1873)
- Doubtful Point , headland of South Georgia in the South Atlantic
- Doubtful River , rivers
- Doubtful Sound , fjord on New Zealand's South Island