Sini Manninen (26 August 1944, Joensuu, Finlande - 23 September 2012, Paris, France) was a Finnish painter and artist, trained at the Académie des Beaux Arts de Helsinki in Finland.
She produced the majority of her works in France, where she moved to in 1973, more precisely, to Montmartre region of Paris.
Mastering many painting techniques (oil, acrylic, watercolors, ink, and charcoal) under various disciplines, naïve art remained her fondest style.