Piet Leidreiter is a German politician. He was federal treasurer of Alternative for Germany until 2015. He was a founding member of the Liberal Conservative Reformers (ALFA) party and was a member of the Bremen Parliament from 2015 to 2019. Since 12 June 2017, he has been a member of the voters' association Citizens in Rage (BIW).

We Citizens is a centre-right to right-wing political party in Germany. Formerly Liberal Conservative Reformers, it was known from July 2015 to November 2016 as ALFA.