Ulf is a common first name in Europe, especially in Scandinavia. ULF can refer to:
- Ultra Large Format, used for cameras producing negatives larger than 8" x 10"
 - Ultra Low Floor, is a type of tram
 - Ultra low frequency, the radio frequency band from 300 Hz to 3 kHz
 - United Labour Front, a defunct political party in Trinidad and Tobago
 - Upplands lantarbetareförbund (Farm Workers Union of Uppland), a Swedish farm workers union
 
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