Sir William Bagge, 1st Baronet (17 June 1810 – 12 February 1880) was a Conservative Party politician in the United Kingdom. He was Member of Parliament (MP) for West Norfolk from 1837 to 1857, and from 1865 to 1880. He was made a baronet in 1867, of Stradsett Hall, in the County of Norfolk.
He was the son of Thomas Philip Bagge and Grace Salisbury, from whom he inherited Stradsett Hall, a large mansion in the parish of Stradsett, near Downham Market in west Norfolk.
He married Frances Preston, with whom he had six children: four daughters, followed by two sons, William (Sir William Bagge, 2nd Baronet) and Thomas (Sir Thomas Bagge, 3rd Baronet). William succeeded his father in the baronetcy, but died childless a year later and was succeeded by his younger brother, Sir Alfred Thomas Bagge, 3rd Baronet.
Between 1836 and 1839, Bagge played in four first-class cricket matches for Norfolk and Marylebone Cricket Club (MCC), scoring 7 runs, holding 2 catches and taking 1 wicket.