The Magnay Baronetcy, of Postford House in the County of Surrey, was a title in the Baronetage of the United Kingdom. It was created on 8 November 1844 for William Magnay, a wholesale stationer and Lord Mayor of London

Lord Mayor of London

The Right Honourable Lord Mayor of London is the legal title for the Mayor of the City of London Corporation. The Lord Mayor of London is to be distinguished from the Mayor of London; the former is an officer only of the City of London, while the Mayor of London is the Mayor of Greater London and...

 from 1843 to 1844. The second Baronet was a novelist. The title became extinct on the death of the third Baronet in 1960.

Christopher Magnay, father of the first Baronet, was Lord Mayor of London from 1821 to 1822.

Magnay Baronets, of Postford House (1844)

• Sir William Magnay, 1st Baronet (1797-1871)
• Sir William Magnay, 2nd Baronet
  Sir William Magnay, 2nd Baronet
  Sir William Magnay, 2nd Baronet was an English baronet and novelist.He was a son of Sir William Magnay, 1st Baronet, and succeeded him to the title in 1871...
  
  (1855-1917)
• Sir Christopher Boyd William Magnay, 3rd Baronet (1884-1960)