Hanna-Katri Aalto (born 24 May 1978) is a Finnish former professional tennis player.
Aalto, who was raised in the town of Kajaani, competed on the professional tour in the late 1990s. Retiring in 2000, she then played a year of college tennis in the United States for the University of Mississippi.
Between 1995 and 2000, Aalto represented the Finland Fed Cup team in a total of 20 ties, winning ten singles and three doubles rubbers. Her best ranked singles opponent beaten was Britain's Julie Pullin in 2000.