Saara Pius (née Saara Kadak; born 20 September 1990), is an Estonian stage, film and television actress and singer.

Saara Pius was born Saara Kadak in Tallinn and attended the primary schools at Katleri Primary School from 1997 until 2000 and the Audentese Private School from 2000 until 2006. Afterwards, she attended Tallinn 32 Secondary School, graduating in 2009. In 2009, she enrolled at the University of Tartu Viljandi Culture Academy's Department of Performing Arts, graduating in 2013.

Pius' first prominent film role was as Liisi in director Ilmar Raag's gritty 2007 feature film Klass for Estonian Culture Film. The film focused on rampant bullying which leads two teens to plan and commit a school shooting. Klass received awards from the Karlovy Vary International Film Festival and the Warsaw International Film Festival and was the official Estonian submission for the Best Foreign Language Film Category of the 80th Academy Awards, although it was not nominated.

In 2014, Pius played the role of Bianka in the Mihkel Ulk-directed drama Nullpunkt for Allfilm and Eesti Telefilm. The film also starred her future partner Märt Pius. In 2018, she appeared in a starring role as Ingrid in the Mikhail Pogosov-directed comedy film Lõbus perekond. She has also appeared in a number of short films.

Saara Kadak had been in a relationship with actor Märt Pius since 2015. In November 2016, the couple announced that they were expecting their first child. On 25 March 2017, Kadak gave birth to a daughter, Susanna. On 9 June 2019, Kadak and Pius married. She has since used her husband's surname personally and professionally. On 31 May 2020, Kadak gave birth to their second child, a son named Mihkel. The family currently resides in Tallinn.