Helmi Lydia Lindelöf (née Helenius; 1884–1966) was a leading Finnish actress of the first half of the 20th century.

[2][1] Lindelöf was regarded as a versatile actor, with a repertoire ranging from classical roles to more modern character acting as well as comedy.

[1] She received both critical and popular acclaim for her meticulously prepared acting, regardless of whether she was playing a lead or supporting role.

[4] In 1946, Lindelöf was awarded the Pro Finlandia [fi] medal of the Order of the Lion of Finland upon her retirement.

[3] In 1906, she married the Helsinki Philharmonic Orchestra's concertmaster Carl Lindelöf [fi]; the couple had three children.