DNL, dnl, or similar, may refer to:

• dnL, a short-lived soft drink produced by Cadbury Schweppes Americas Beverages
• Day-Night Average Sound Level, a measure of average noise level over a day
• Det Norske Luftfartsselskap, one of the four Scandinavian airlines merged to produce Scandinavian Airlines System (SAS)
• Differential nonlinearity error, in electronics and digital signal processing
• Discard to next line, a comment delimiter in the m4 macro language

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