Dalin is a Swedish surname. The name frequently appears as Dahlin. Both surnames are derived from the Swedish word dal meaning valley. Notable people with the surname include:
- David G. Dalin (born 1949), Jewish American historian
- Kalle Dalin (born 1975), Swedish orienteering competitor and European champion
- Per Dalin (1936–2010), Norwegian educationalist
- Olof von Dalin (1708–1763), Swedish poet
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