病毒進化是指病毒為適應環境而進行的改變、突變和變異。例如病毒變得更容易傳播或致病性更嚴重[1]，而且病毒突變後的特徵可以遺傳給後代。病毒突變過快會給疫苗和抗病毒藥物的開發帶來麻煩，因為病毒會變得具有抗藥性。不過病毒的突變對病毒本身未必一定有好處。
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