| Otto A. Frostman | |
| Birth Date: | 3 January 1907 |
| Birth Place: | Höör, Sweden |
| Death Place: | Djursholm, Sweden |
| Nationality: | Swedish |
| Fields: | Mathematics |
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| Doctoral Advisor: | Marcel Riesz |
| Known For: | Frostman lemma |
Otto Albin Frostman (3 January 1907 - 29 December 1977) was a Swedish mathematician, known for his work in potential theory and complex analysis.
Frostman earned his Ph.D. in 1935 at Lund University under the Hungarian-born mathematician Marcel Riesz, the younger brother of Frigyes Riesz. In potential theory, Frostman's lemma is named after him.[1] He supervised the 1971 Stockholm University Ph.D. thesis of Bernt Lindström, which initiated the "Stockholm School" of topological combinatorics (combining simplicial homology and enumerative combinatorics).