Rebekka Armstrong (born February 20, 1967 in Bakersfield, California) is a former Playboy Playmate, whose announcement in 1994 that she was HIV-positive made international headlines.

Armstrong appeared in Playboy's September 1986 issue, and tested positive for HIV in 1989. When she made her public announcement in 1994, she became (along with Magic Johnson) one of the best-known public faces of heterosexual HIV transmission. In her speaking engagements, she notes that despite popular stereotypes of the wild sexual lives enjoyed by Playboy Playmates, she had in fact contracted HIV from a relatively normal teenage sexual encounter.

She is now an HIV/AIDS awareness activist and safer sex educator, and a spokesperson for several HIV-related charity groups.

She is married to Oliver Luettgenau , a personal trainer who is also an HIV activist.