Surname Lassen (Lasi 
, Lacer 
, Lassen 
) , around the globe, is a common cognomen. The cognomen Lassen is habitual in Denmark, where it is quite a common surname, Solomon Islands, and Norway, where it is quite a rare surname. In absolute terms, the name is most common in Denmark, the United States, and Germany. Also, Lassen is the forename as well as the last name.
| niels lassen (b. 1525) |
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| peder lassen Danish judge (1606-1681) (b. 1606) |
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| johan jørgen lassen Danish painter (1700-1767) (b. 1700) |
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lars lassen DK (b. 1761) |
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| niels lassen Danish farmer, DK (b. 1729) |
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christian lassen Norwegian-German orientalist (1800-1876), DE (b. 1800) |
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peter lassen American pioneer, US (b. 1800) |
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| nicolai christian vendelboe lassen (b. 1748) |
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| jørgen lassen Danish painter (1776-1850), DK (b. 1776) |
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| christian ludvig lassen (b. 1767) |
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eduard ludvig lassen composer, conductor (1830-1904), DE (b. 1830) |
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gregers lassen (b. 1832) |
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| frederik lassen Danish merchant and inspector of Greenland (1798–1872), DK (b. 1798) |
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| paul brodahl lassen (b. 1795) |
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| gustav frederik lassen DK (b. 1801) |
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