Gwendoline Maud Parry Plunket Greene (6 February 1878 - 29 July 1959) was an English writer on religion.
Gwendoline Maud Parry was born on 6 February 1878, in Kensington, London, the daughter of Sir Charles Hubert Hastings Parry, 1st Baronet, composer, teacher and historian of music, and Lady Elizabeth Maud Herbert, daughter of Sidney Herbert, 1st Baron Herbert of Lea and Elizabeth Herbert, Baroness Herbert of Lea. Her elder sister, Dorothea "Dolly" Parry (1876–1963), married the politician Arthur Ponsonby, 1st Baron Ponsonby of Shulbrede in 1898, and had a son and a daughter, the Bright Young Things Elizabeth Ponsonby and Matthew Ponsonby, 2nd Baron Ponsonby of Shulbrede.
The Parry sisters grew up amidst "the heart of late Victorian musical and artistic society", as Greene would tell later to Evelyn Waugh, friends to her children. She mentioned dinner parties with Beatrix Potter and Oscar Wilde. As a child Gwen Greene was very attractive and she won a beauty show as a teenager. She was an accomplished violinist and performed at a concert in 1891.
After the death of a previous fiancé, on 20 July 1899, she married Harry Plunket Greene. Their children were the Bright Young Things Richard George Hubert Plunket Greene, David Plunket Greene and Olivia Honor Mary Plunket Greene. They separated in 1919 and she decided to bring up her children alone.Evelyn Waugh was a frequent guest of the Plunket Greene, he was in love with all the family. It has been said that Waugh's conversion to catholicism was favored by Gwen Greene giving him von Hugel's letter and her book, Mount Zion.