Lena Söderberg, née Sjööblom (born 31 March 1951) is a Swedish model who appeared as a Playmate in the November 1972 issue of Playboy magazine, as Lenna Sjööblom. Her centerfold was photographed by Dwight Hooker.
A section of her centerfold (known as Lenna) is often used to test algorithms in digital image processing. She was a guest at the 50th annual Conference of the Society for Imaging Science and Technology in 1997, where she gave a presentation about herself. Because of the ubiquity of her Playboy photo scan, she has been called the "first lady of the internet". The title was given to her by Jeff Seideman in a press release he issued announcing her appearance at the 50th annual IS&T Conference. Söderberg is married and has three children.