Sir Robert Geoffrey Edwards (27 September 1925 – 10 April 2013) was a British physiologist and pioneer in reproductive medicine, and in-vitro fertilisation (IVF) in particular. Along with obstetrician and gynaecologist Patrick Steptoe and nurse and embryologist Jean Purdy, Edwards successfully pioneered conception through IVF, which led to the birth of Louise Brown on 25 July 1978. They founded the first IVF programme for infertile patients and trained other scientists in their techniques. Edwards was the founding editor-in-chief of Human Reproduction in 1986. In 2010, he was awarded the Nobel Prize in Physiology or Medicine "for the development of in vitro fertilization".

Edwards was born in Batley, Yorkshire, and attended Manchester Central High School on Whitworth Street in central Manchester, after which he served in the British Army, and then completed his undergraduate studies in biology, graduating with an ordinary degree from Bangor University. He studied at the Institute of Animal Genetics and Embryology at the University of Edinburgh, where he was awarded a PhD in 1955 under the supervision of R.A. Beatty and C. H. Waddington.

After a year as a postdoctoral research fellow at the California Institute of Technology he joined the scientific staff of the National Institute for Medical Research at Mill Hill. After a further year at the University of Glasgow, in 1963 he moved to the University of Cambridge as Ford Foundation Research Fellow at the Department of Physiology, and a member of Churchill College, Cambridge. He was appointed Reader in physiology in 1969.

Circa 1960 Edwards started to study human fertilisation, and he continued his work at Cambridge, laying the groundwork for his later success. In 1968 he was able to achieve fertilisation of a human egg in the laboratory and started to collaborate with Patrick Steptoe, a gynaecological surgeon from Oldham. Edwards developed human culture media to allow the fertilisation and early embryo culture, while Steptoe used laparoscopy to recover ovocytes from patients with tubal infertility. Their attempts met significant hostility and opposition, including a refusal of the Medical Research Council to fund their research and several lawsuits. Roger Gosden was one of his first graduate students.

The birth of Louise Brown, the world's first 'test-tube baby', at 11:47 pm on 25 July 1978 at the Oldham General Hospital made medical history: in vitro fertilisation meant a new way to help infertile couples who formerly had no possibility of having a baby. Nurse Jean Purdy was the first to see Brown's embryo dividing.

Refinements in technology have increased pregnancy rates and it is estimated that in 2010 about 4 million children have been born by IVF, with approximately 170,000 coming from donated oocyte and embryos. Their breakthrough laid the groundwork for further innovations such as intracytoplasmatic sperm injection ICSI, embryo biopsy (PGD), and stem cell research.

Edwards, Purdy, and Steptoe founded the Bourn Hall Clinic as a place to advance their work and train new specialists. Purdy died in 1985 and Steptoe in 1988. Edwards continued in his career as a scientist and an editor of medical journals.

Edwards received numerous honours and awards including: