William Cecil Pery, 1st Baron Glentworth (26 July 1721 – 4 July 1794) was an 18th-century Anglican bishop in Ireland. 
He was born on 26 July 1721, the son of Reverend Stackpole Pery and Jane Twigg, daughter of William Twigg, Archdeacon of Limerick, and educated at Trinity College, Dublin.  His elder brother was Edmund Pery, 1st Viscount Pery and younger sister was Lucy Hartstonge the founder of what is now St John's Hospital.
He was Dean of Killaloe (1772-1780) and then Derry. Pery was nominated Bishop of Killala and Achonry on 7 January 1781 and consecrated on 18 February that year. He was translated to Limerick, Ardfert and Aghadoe on 13 May 1784. He was created Baron Glentworth, of Mallow in the Peerage of Ireland, in 1790 and died on 4 July 1794. William Street in Limerick is named after him,  as were Cecil Street, Glentworth Street and Mallow Street. 
Pery firstly married Jane Walcott, daughter of John Minchin Walcott, and following her death, married secondly Dorothea Lewis, daughter of William Lewis, Archdeacon of Kilfenora. He was succeeded in his title by his son, Edmund Pery, who was later made Earl of Limerick. His daughter, Hon. Eleanor Pery, married Sir Vere Hunt, 1st Baronet. She died in 1821. 
Thomas Spring Rice, 1st Baron Monteagle of Brandon, was a British Whig politician, who served as Chancellor of the Exchequer from 1835 to 1839.
Earl of Limerick is a title that has been created twice in the Peerage of Ireland, associated first with the Dongan family, then with the Pery family.
Viscount Limerick may refer to two different viscountcies in the Peerage of Ireland:
William Hale John Charles Pery, 3rd Earl of Limerick, KP, PC, DL, JP, styled Viscount Glentworth until 1866, was an Irish peer and Conservative politician. He served as Captain of the Yeomen of the Guard under Lord Salisbury between 1889 and 1892 and again between 1895 and his death in 1896. In 1892 he was made a Knight of the Order of St Patrick.
Patrick Edmund Pery, 6th Earl of Limerick KBE, AM, DL, was an Irish peer, banker and public servant.
Colonel Edmund Colquhoun Pery, 5th Earl of Limerick was a British peer and soldier.
William Beresford, 1st Baron Decies was an Anglo-Irish clergyman.
Pery may refer to:
Edmund Sexton Pery, 1st Viscount Pery was an Anglo-Irish politician who served as Speaker of the Irish House of Commons between 1771 and 1785.
Thomas Knox, 1st Earl of Ranfurly, styled The Honourable Thomas Knox between 1781 and 1818 and known as The Viscount Northland between 1818 and 1831, was an Irish peer and politician.
Thomas Knox, 2nd Earl of Ranfurly, styled Viscount Northland between 1831 and 1840, was an Anglo-Irish peer and politician.
Richard Boyle was an English bishop who became Archbishop of Tuam in the Church of Ireland. He was the second son of Michael Boyle, merchant in London, and his wife Jane, daughter and co-heiress of William Peacock. His younger brother was Michael Boyle, bishop of Waterford.
Sir Henry Hartstonge, 3rd Baronet was an Anglo-Irish politician and landowner who sat in the Irish House of Commons as member for Limerick County. He was a close political associate of his influential brother-in-law Edmund Pery, 1st Viscount Pery. He gave his name to Hartstonge Street, Limerick.
Sir Vere Hunt, 1st Baronet of Currah was an Irish politician, landowner and businessman. He is chiefly remembered for founding the village of New Birmingham in County Tipperary, for his ill-advised purchase of the island of Lundy, and for his entertaining diary. He was a colourful character, who was noted for his heavy drinking and gambling, but also for his intellectual interests, and his stern criticism of his own class.
William Street is one of the main thoroughfares of central Limerick City, Ireland. The street starts at a junction with O'Connell Street and continues in a south-east direction, where it is called Upper William Street. The street is named after William Pery, 1st Baron Glentworth a relation of Edmund Sexton Pery who is credited with the development of the present day Limerick City Centre area known as Newtown Pery.
Henry Street is a street in Limerick, Ireland. The street is named after Edmund Henry Pery, 1st Earl of Limerick who had a house on the street which is now occupied by the Hibernian Insurance Company. The street runs parallel to the River Shannon and O'Connell Street.
Edmund Henry Pery, 1st Earl of Limerick PC, styled Lord Glentworth between 1794 and 1800, and Viscount Limerick until 1803, was an Irish peer and politician.
William Henry Edmund de Vere Sheaffe, 4th Earl of Limerick DL 16 September 1863 – 18 March 1929), styled Viscount Glentworth until 1896, was an Irish peer and British Army officer.
Sir Aubrey (Hunt) de Vere, 2nd Baronet was an Anglo-Irish poet and landowner.
Lucy Hartstonge was an Irish heiress and philanthropist who founded the first fever hospital in Ireland, in the late 18th century.