Catarina de Lemos Wallenstein (born 23 August 1986) is a Portuguese actress.

Wallenstein was born in London, daughter of Pedro Franco Wallenstein Teixeira, double bass player of the Portuguese Symphonic Orchestra, and Lúcia de Castro Cardoso de Lemos, a lyric singer.

She studied at the Lisbon Theatre and Film School.

She joined the choir of the Children's Music Foundation,[2] where she also studied cello and choral singing.

The same foundation led her to participate in the children's ensembles of operas such as Tosca, La Bohème, Carmen, in the National Theatre of Saint Charles.