thumb|Gustav II Adolf in Polish '[[Delia (clothing)|delia' coat, painting by Matthäus Merian, 1632.]]
thumb|Alchemical illustration, ''Musaeum Hermeticum'', 1678.
thumb|Discursus XXXI, Epigramma XXXI, from ''Atalanta Fugiens'', 1618.
Matthäus Merian der Ältere (or "Matthew", "the Elder", or "Sr."; 22 September 1593 – 19 June 1650) was a Swiss-born engraver who worked in Frankfurt for most of his career, where he also ran a publishing house. He was a member of the patrician Basel Merian family.