Giron () is a commune in the Ain department in eastern France.
Giron has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Giron is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in July, at around , and lowest in January, at around . The highest temperature ever recorded in Giron was on 13 August 2003; the coldest temperature ever recorded was on 12 January 1987.