Margaret Wertheim (born 20 August 1958) is an Australian-born science writer based in the United States.
She is the author of books on the cultural history of physics.
Wertheim and her twin sister, Christine Wertheim, live together in Los Angeles, California, where they founded and continue to operate the Institute For Figuring (IFF).
The institute is a non-profit organisation which houses their Crochet Coral Reef, which began as a response to the hyperbolic crocheting abilities of Daina Taimina, a Cornell University mathematician.
Wertheim also creates exhibitions at the intersection of science and art which are shown around the world.
She won the 2016 Klopsteg Memorial Award from the American Association of Physics Teachers and Australia's Scientia Medal (2017) for her work with public science engagement.