Lalla Carlsen (née Haralda Petrea Christensen) (17 August 1889 – 23 March 1967) was a Norwegian singer and actress.

[1] Lalla Carlsen was born in Svelvik as the daughter of shipmaster Carl Alfred Christensen and Laura Nilsson.

[2] Their daughter Gjertrud Carlsen (1919–2007) was also a pianist on Chat Noir, wrote several children's songs and was the mother of NRK media personality Vibeke Sæther (born 1943).

[4] Her introduction of Finn Bø and Arild Feldborg's song Norge i rødt, hvitt og blått in 1945 was met with wild enthusiasm.

She acted in O'Neill's Skjønne ungdom at Rogaland Teater, played the character "Mrs. Peachum" in an adaptation of Brecht/Kurt Weill's musical The Threepenny Opera at Riksteatret, the character "Aase" in Ibsen's verse drama Peer Gynt, and played in O'Neill's drama Anna Christie.