Agnieszka Sienkiewicz-Gauer (born 19 July 1984) is a Polish actress.

Sienkiewicz made her debut on the small screen in 2007, playing minor roles in the series Klan, Plebania and Twarzą w twarz.

She portrayed Magda Jaroszek, one of the lead characters in the series Agentki (2008), and portrayed the role of Wiki in the series Prosto w serce (2010–2011) and Katarzyna Mularczyk in M jak miłość (2011-2015).

In 2014, together with Stefano Terrazzino,[3] she won the fifteenth season of the light entertainment reality television series Dancing with the Stars: Taniec z gwiazdami.

She runs a store with children's and family goods at Piotrkowska Street in Łódź.