William Cadogan (1711 – 26 February 1797) was an 18th-century British physician and writer on child care and nursing.

On 1740s Cadogan became an honorary medical attendant of the London Foundling Hospital for abandoned babies.

In 1752 he moved to live in Hanover Square, London, resigning his post at Bristol and the following year was appointed Physician at the Foundling Hospital.

In 1762 he sailed as Physician to the Army to Lisbon, Portugal but was forced by illness (gout) to return home after seven months.

The infants should be breastfed for at least a year, preferably with the milk of the mother or a good wet nurse, with some solid food after three months.

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