The Modern English Archbishop,
English Bishops, Old and New,
The Normal Dean of the Present Day,
The Parson of the Parish,
The Town Incumbent,
The College Fellow Who Has Taken Orders,
The Curate in a Populous Parish,
The Irish Beneficed Clerygman,
The Clergyman Who Subscribes for Colenso.
These first appeared in Pall Mall Gazette.
The Civil Service as a Profession, 1861
The Present Condition of the Northern States of the American Union, (1862 or 1863),
Higher Eduction of Women', 1868,
On English Prose Fiction as a Rational Amusement, 1870.
The Man who Hunts and Doesn't Like It,
The Man Who Hunts and Does Like It,
The Lady Who Rides to Hounds,
The Hunting Farmer,
The Man Who Hunts and Never Jumps,
The Hunting Parson,
The Master of Hounds,
How to Ride to Hounds.
Father Giles of Ballymoy,
La Mère Bauche,
The Journey to Panama,
Miss Ophelia Gledd;
A Walk in a Wood.
Merivale's History of the Romana [Review of Charles Merivale's The History of the romana under the Empire, Vols I and II]. Dublin University Magazine, May 1851
Merivale's History of the Romans (Review of Vols II, IV, and V]. Dublin University Magazine, July 1856
The Civil Service. Dublin University Magazine, October 1855
The Civil Service as Profession. Cornhill Magazine, February 1861
The National Gallery. St James's Magazine, September 1861
My Tour in Holland. Cornhill Magazine, NOvember 1862 W. M Thackeray. Cornhill Magazine, February 1864
Henry Taylor's Poems [Review]. Fortnightly Review, June 1, 1865
On Anonymous Literature. Fortnightly Review, July 1, 1865
Ruskin's Sesame and Lilies [Review]. Fortnightly Review, July 15, 1865
The Irish Church. Fortnightly Review, August 15, 1865
James Hannay's Characters and Criticisms [Review]. Fortnightly Review, Sepember 1, 1865
Captain W. A. Bkaer's The Day and the House [Review]. Fortnightly Review, September 15, 1865
Public Schools. Fortnightly Review, October 1, 1865
The Civil Service. Fortnightly Review, October 15, 1865
The Fourth Commandment. Fortnightly Review, January 15, 1865
Charles Buxton's The Ideas of the Day on Policy [Review]. Fortnightly Review, January 15, 1866
Alberto Maro's The Red Shirt [Review]. Fortnightly Review, February 1, 1866
R. H. Hutton's Studies in Parliament [Review]. Fortnightly Review, April 1, 1866.
Sir M. Peto's Resources and Prosperity of American [Review]. Fortnightly Review, May 15, 1866
Goldwin Smith's The Civil War in America. [Review]. Fortnightly Review, June 1, 1866
Ruskin's The Crown of Wild Olive [Review]. Fortnightly Review, June 15, 1866
Harriet Parr's The Life and Death of Jeanne d'Arc [Review]. Fortnightly Review, October 15, 1866 On the Best Means of Securing an International Law of Copyright. Transactions of the National Association for the Promotion of Social Science, 1866 
Mrs. Sewell's The Rose of Cheriton [Review]. Fortnightly Review, February 1, 1867
George Rooper's Flood, Field and Forest [Review]. Fortnightly Review, June 1, 1869.
Mr Freeman on the Morality of Hunting. Fortnightly Review, December 1, 1869.
Cicero as a Politician. Fortnightly Review, April 1, 1877.
Whist at Our Club. Blackwood's Magazine, May 1877
The Young Women at the London Telegraph Office. Good Words, June 1877
Cicero as a Man of Letters. Fortnightly Review, September 1, 1877
Kafir Land. Fortnightly Review, February 1, 1878
Iceland. Fortnightly Review, August 1, 1878
George Henry Lewes. Fortnightly Review, January 1, 1879
Novel Reading: The Works of Charles Dickens, The Works of W. Makepeace Thackeray. The Nineteenth Century, January 1879
In the Hunting Field. Good Words, February 1879
The Genius of Nathaniel Hawthorne. North American Review, September 1879
A Walk in the Wood. Good Words, September 1879
Henry Wadsworth Longfellow. North American Review, April 1881
The Family that Goes Abroad Because It's the thing to Do
The Man Who Tavels Alone
The Unprotected Female Tourist
The United Englishmen Who Travel for Fun
The Art Tourist. [The one shows Trollope had real knowledge of and interest in painting]
The Tourist in Search of Knowledge
The Alpine Club Man
Tourist Who Don't Like Their Travels.
On Sovereignty. October 1867
About Hunting. November 1867
About Hunting. Part II. March 1868
An Essay on Carlylism: Containg the Very Melancholy Story of a Shoddy Maker and His Mutinous Maid-Servant. December 1867
The Uncontrolled Ruffianism of London: As Measured by teh Rule of Thumb. January 1868
Whom Shall We Make Leader of the New House of Commons? February 1868
The Irish Church Debate. May 1868
American Reconstruction. September 1868
Clarissa [by Samuel Richardson; abridged by E. S. Dallas]. November 1868
The New Cabinet, and What It Will Do for Us. Feburary 1869
President Johnson's Last Message. March 1869
Mr Disraeli and the Mint. May 1869
The Irish Church Bill in the Lords. August 1869
Formosa [the prostitute in Don Boucicault's play of that name]. Ocotber 1869
What Does Ireland Want? December 1869
Mr Gladstone's Irish Land Bill. March 1870
Ancient Classics for English Readers. March 1870
Charles Dickens. July 1870
Mr Disraeli and the Dukes. August 1870
The English Aspect of the War. September 1870.
The above lists available texts whether in print or not in alphabetical order by title. The Trollope Society has also published the four large travel books and Trollope's Life of Cicero. Facsimile reprints of the original texts are used, and there are brief introductory essays, but no notes. I have also not listed all the abridged editions of Trollope's non-fiction (e.g., Alan Sutton's).
Other books and essays which include scattered commentary, mostly contemporary with and by Trollope himself on the short stories will be found in the other bibliographies in this Trollope region.