Rain Epler (born 6 June 1977) is an Estonian politician. He served as Minister of the Environment in the second cabinet of Prime Minister Jüri Ratas from 16 November 2020 to 26 January 2021. Tõnis Mölder was appointed as his successor. He is affiliated with the Conservative People's Party of Estonia (EKRE).
In the 2021 local government council elections, Rain Epler was the EKRE mayoral candidate in Võru. He received 221 votes in the elections and was elected to the Võru City Council, where he serves as the chairman of the audit committee.
In the 2023 Riigikogu elections, he is a candidate for EKRE in electoral district number 11, which covers Võru, Valga, and Põlva counties.