Daniel Peter Layard (1721–1802) was an English physician and midwife.
Layard was the son of a certain Major Layard.
Layard graduated Doctor of Medicine at Reims University on 9 March 1742. In April 1747 he was appointed physician-accoucheur at Middlesex Hospital, but shortly afterwards he resigned on account of ill health and travelled abroad.
In 1750 Layard settled at Huntington, practising there for twelve years. On 3 July 1752 he was admitted a Licentiate of the College of Physicians (now the Royal College of Physicians of London). In c. 1762 he returned to London, where he soon obtained an extensive practice as an accoucheur.
Layard was physician to Princess Augusta of Saxe-Gotha, Princess, and Dowager Princess, of Wales. He was elected a Fellow of the Royal Society and a Fellow of the Royal Society of Sciences of Göttingen (now the Göttingen Academy of Sciences and Humanities). Layard was a founder of the British Lying-in Hospital, of which he was later appointed a Vice President. On 20 June 1792 he was admitted to the degree of Doctor of Civil Law honoris causa at the University of Oxford.
Layard died at Greenwich in February 1802. His son Charles had become Dean of Bristol.