Cognomen Mačiūnas (Mačiūnas 
) , all around the world, is a very rare last name. The cognomen Mačiūnas is characteristic of Northern Europe, particularly Lithuania, where it is quite a rare surname.
| aleksandras mačiūnas Lithuanian physicist (1902-1954), LT (b. 1902) |
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| leonas laimutis mačiūnas chess player (1928-2014), LT (b. 1928) |
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| erikas mačiūnas Lithuanian politician, LT (b. 1955) |
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