В 1899 году леди Грегори, вместе с некоторыми другими литераторами, создаёт Ирландский литературный театр просуществовавший до 1901 года и закрывшийся ввиду финансовых сложностей. В 1904 году И. Грегори, У. Б. Йейтс, Джон Синг, Джордж У. Расселл, Энни Хорниман, Уильям и Фрэнк Фрей организуют Ирландское национальное театральное общество. Общество покупает для своих нужд два здания в Дублине на Мальборо-стрит и Лоуэр-Эбби стрит и создаёт в них ирландский Театр Аббатства, которым леди Грегори руководит до 1928 года. За это время она пишет около 40 драматических произведений для своего театра. В 1919 году Грегори играет на сцене в главной роли в трёх постановках спектакля Cathleen Ni Houlihan.

Через 3 месяца после смерти писательницы (она скончалась в возрасте 80-ти лет от рака груди) её имущество из имения Кул-парк было распродано с торгов, а само здание, с которым была тесно связана история ирландского литературного возрождения Irish Literary Revival, пришло в полное запустение и в 1941 году было снесено.

Избранная драматургия

• Twenty Five (1903)
• Spreading the News (1904)
• Kincora: A Play in Three Acts (1905)
• The White Cockade: A Comedy in Three Acts (1905)
• Hyacinth Halvey (1906)
• The Doctor in Spite of Himself (1906)
• The Canavans (1906)
• The Rising of the Moon (1907)
• Dervorgilla (1907)
• The Workhouse Ward (1908)
• The Rogueries of Scapin (1908)
• The Miser (1909)
• Seven Short Plays (1909)
• The Image: A Play in Three Acts (1910)
• The Deliverer (1911)
• Damer’s Gold (1912)
• Irish Folk History Plays (First Series 1912, Second Series 1912)
• McDonough’s Wife (1913)
• The Image and Other Plays (1922)
• The Dragon: A Play in Three Acts (1920)
• The Would-Be Gentleman (1923)
• An Old Woman Remembers (1923)
• The Story Brought by Brigit: A Passion Play in Three Acts (1924)
• Sancha’s Master (1927)
• Dave (1927)

Проза и переводы

• Arabi and His Household (1882)
• Over the River (1887)
• A Phantom’s Pilgrimage, or Home Ruin (1893)
• Hrsg., Sir William Gregory, KCMG: An Autobiography (1894)
• Hrsg., Mr Gregory’s Letter-Box 1813-30 (1898)
• Hrsg., Ideals in Ireland: A Collection of Essays written by AE and Others (1901)
• Cuchulain of Muirthemne: The Story of the Men of the Red Branch of Ulster arranged and put into English by Lady Gregory (1902)
• Ulster (1902)
• Poets and Dreamers: Studies and Translations from the Irish (1903)
• Gods and Fighting Men (1904)
• A Book of Saints and Wonders, put down here by Lady Gregory, according to the Old Writings and the Memory of the People of Ireland (1906)
• The Kiltartan History Book (1909)
• A Book of Saints and Wonders (1906)
• Our Irish Theatre: A Chapter of Autobiography (1913)
• Kiltartan Poetry Book, Translations from the Irish (1919)
• Visions and Beliefs in the West of Ireland (1920)
• Hugh Lane’s Life and Achievement, with some account of the Dublin Galleries (1921)
• Case for the Return of Sir Hugh Lane’s Pictures to Dublin (1926)
• Seventy Years (1974).

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