The Estonian Reform Party is a liberal political party in Estonia. The party has been led by Kaja Kallas since 2018. It is colloquially known as the "Squirrel Party", referencing its logo.

Kaja Kallas is an Estonian politician and the current prime minister of Estonia since 2021, the first woman to serve in the role. The leader of the Reform Party since 2018, she was a member of parliament (Riigikogu) in 2011–2014, and 2019–2021. Kallas was a member of the European Parliament in 2014–2018, representing the Alliance of Liberals and Democrats for Europe. Before her election to Riigikogu, she was a lawyer specialising in European competition law.