In 1911, he married Irma Perry. ‎Artist and feminist Gwendolyn Perry, Irma's ‎daughter from her first marriage, renamed herself  Gwen Le Gallienne.
They moved to Paris in the late 1920s, becoming part of the expatriate bohéme. In his memoir From a Paris Garret (1936), Richard records
his contact with Joyce, Pound, Hemingway, and others.

My Ladies' Sonnets (1887) 
Volumes in Folio (1889) 
George Meredith: Some Characteristics (1890) 
The Book-Bills of Narcissus (1891) 
English Poems (1892) 
The Religion of a Literary Man (1893) 
Robert Louis Stevenson: An Elegy and Other Poems (1895) 
Quest of the Golden Girl (1896) 
Prose Fancies (1896) 
Retrospective Reviews (1896) 
Rubaiyat of Omar Khayyam (1897) 
If I Were God (1897) 
The Romance Of Zion Chapel (1898) 
In Praise of Bishop Valentine (1898) 
Young Lives (1899) 
Sleeping Beauty and Other Prose Fancies (1900) 
The Worshipper Of The Image (1900) 
The Love Letters of the King, or The Life Romantic (1901) 
An Old Country House (1902) 
Odes from the Divan of Hafiz (1903) translation 
Old Love Stories Retold (1904) 
Painted Shadows (1904) 
Romances of Old France (1905) 
Little Dinners with the Sphinx (1907) 
Omar Repentant (1908) 
Wagner's Tristan and Isolde (1909) 
Translator Attitudes and Avowals (1910) 
essays October Vagabonds (1910) 
New Poems (1910) 
The Maker of Rainbows (1912) 
The Lonely Dancer and Other Poems (1913) 
The Highway to Happiness (1913) 
Vanishing Roads and Other Essays (1915) 
The Silk-Hat Soldier (1915) 
The Chain Invisible (1916) 
Pieces of Eight (1918) 
The Junk-Man and Other Poems (1920) 
A Jongleur Strayed (1922) poems 
Woodstock: An Essay (1923) 
The Romantic '90s (1925) memoirs 
The Romance of Perfume (1928) 
There Was a Ship (1930) 
From a Paris Garret (1936) memoirs 
The Diary of Samuel Pepys (editor)

In later life Richard lived in Menton on the French Riviera. During the 1940s, his home was occupied by German troops and his library was nearly sent back to Germany as bounty. Richard refused to write propaganda for the local German and Italian authorities, and with no income, once collapsed in the street due to hunger. He died in 1947 aged 8I and was buried in Menton, in the same cemetery as Aubrey Beardsley. His second daughter, Eva Le Gallienne, went on to become a famous actress and producer.

Of all the poets I know, I think Richard Le Gallienne looks most like a poet. For Richard Le Gallienne always represented to my mind the last of the great figures of the Nineties; and in truth, because of a certain look of fatality he wore over his shoulders, like Caesar's cloak, one was constantly being reminded that one was talking with a man who had sat at meat with Swinburne, with Downson, with Lionel Johnson, and with Oscar Wilde. In later days, I used to walk with him in the Catskill Mountains, and have seen him many times come toward me with his jacket on his arm, light of step as any fisher-boy; but even then I never lost the impression, though we might be happy for long hours together, that in some curious way he was set apart, that he was hearing, from the hollow chasms of the great stone-quarries he loved, a voice I could not hear, seeing through the slim trunks of the silver birches which rose out of the bracken a form that I could not see.
(Llewelyn Powys, The Verdict of Bridlegoose)