Einarsson is a surname of Scandinavian origin, meaning son of Einar. In Icelandic names, the name is not strictly a surname, but a patronymic. The name refers e.g. to:
- Björn Einarsson (b. 1978), Swedish bandy player
- Gissur Einarsson (1512–1548), Icelandic Protestant clergyman; first Lutheran bishop in Iceland
- Gylfi Einarsson (b. 1978), Icelandic professional football player
- Magnús Einarsson (1092–1148), Icelandic Roman Catholic clergyman; Bishop of Skálholt 1134–48
- Mats Einarsson (b. 1960), Swedish politician; member of the Riksdag 1998–2006
- Per Einarsson (b. 1984), Swedish bandy player
- Sigfús Einarsson (1877−1939), Icelandic composer
- Sveinn Einarsson (b. 1934), Icelandic theater director
- Thorfinn Turf-Einarsson, Earl of Orkney (b. unknown, d. 963), Earl of Orkney
- Ulf Einarsson (b. 1981), Swedish bandy player
- Vilhjálmur Einarsson (b. 1934), Icelandic Olympic athlete
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