Oda Krohg, née Othilia Pauline Christine Lasson (11 June 1860 – 19 October 1935) was a Norwegian painter, and the wife of her teacher and colleague Christian Krohg.
She was the second daughter of public attorney Christian Lasson and Alexandra von Munthe af Morgenstierne. Her maternal grandmother was a Russian princess. She grew up in a liberal-conservative household, along with eight sisters and two brothers. Her brother Per Lasson became a noted composer and her sister Caroline Bokken Lasson a singer and writer.
In 1881 she married the businessman Jørgen Engelhardt (1852–1921), with whom she had two children. She split from Engelhardt in 1883, and divorced him in 1888. In 1885 she became a student of Erik Werenskiold and Christian Krohg, the latter she would marry in October 1888. In 1885, their daughter Nana was born, and in 1889, their son Per, who also would be a known painter.
In the period 1901–1909, the family lived in Paris. In Edvard Munch's etching kafeinteriør (1893), Oda is surrounded by bohemians and people close to them: Munch, Christian Krohg, Jappe Nilssen, Hans Jæger, Gunnar Heiberg and Jørgen Engelhardt. Oda is said to have had affairs with all of these men apart from Munch. In his book Syk Kjærlihet ("Diseased Love", 1893), Hans Jæger describes a love triangle where he was strongly in love with a woman who was to marry a painter. Oda is said to have been the model for the woman, and the book describes the relation between Jæger, Oda and Christian during the summer and autumn of 1888.
In the 1890s the Krohgs moved to Berlin. During a quarrel with August Strindberg, who became provoked when Oda tuned his guitar in front of the guests at a party at Strindberg's favorite bar, "Zum Schwarzen Ferkel", the dramatist Gunnar Heiberg defended her. August Strindberg was known for his bad temper and his several conflicts with others, for no particular reason.