| The Profits of Religion | (1900) | Description / Buy at Amazon |
| Good Health and How We Won It | (1909) | Description / Buy at Amazon |
| The Fasting Cure | (1911) | Description / Buy at Amazon |
| The Sinclair-Astor Letters | (1914) | Description / Buy at Amazon |
| The High Cost of Living | (1919) | Description / Buy at Amazon |
| The Industrial Republic | (1919) | Description / Buy at Amazon |
| Russia: a Challenge | (1919) | Description / Buy at Amazon |
| Socialism and How It is Coming | (1920) | Description / Buy at Amazon |
| The Goose Step | (1922) | Description / Buy at Amazon |
| The Goslings | (1924) | Description / Buy at Amazon |
| Letters to Judd: An American Workingman | (1926) | Description / Buy at Amazon |
| The Spokesman’s Secretary: Being the Letters of Mame To Mom | (1926) | Description / Buy at Amazon |
| Money Writes | (1927) | Description / Buy at Amazon |
| The Crimes of the Times: A Test of Newspaper Decency | (1929) | Description / Buy at Amazon |
| Mental Radio | (1929) | Description / Buy at Amazon |
| Upton Sinclair on Comrade Kautsky | (1931) | Description / Buy at Amazon |
| Upton Sinclair, Station A | (1931) | Description / Buy at Amazon |
| American Outpost; A Book Of Reminiscences | (1932) | Description / Buy at Amazon |
| Candid Reminiscences: My First 30 Years | (1932) | Description / Buy at Amazon |
| I, Governor of California, and How I Ended Poverty | (1933) | Description / Buy at Amazon |
| The Way Out: What Lies Ahead for America | (1933) | Description / Buy at Amazon |
| The Epic Plan for California | (1934) | Description / Buy at Amazon |
| Upton Sinclair’s Last Will and Testament | (1934) | Description / Buy at Amazon |
| Immediate EPIC | (1934) | Description / Buy at Amazon |
| Epic Answers | (1935) | Description / Buy at Amazon |
| I, Candidate for Governor | (1935) | Description / Buy at Amazon |
| Wally For Queen | (1936) | Description / Buy at Amazon |
| We, People of America | (1936) | Description / Buy at Amazon |
| No Pasaran! | (1937) | Description / Buy at Amazon |
| Letters to a Millionaire | (1938) | Description / Buy at Amazon |
| Terror in Russia? | (1938) | Description / Buy at Amazon |
| What Can Be Done About America’s Economic Troubles? | (1939) | Description / Buy at Amazon |
| Your Million Dollars | (1939) | Description / Buy at Amazon |
| Peace or War in America | (1941) | Description / Buy at Amazon |
| To the Conquered Peoples of Europe | (1941) | Description / Buy at Amazon |
| To Solve the German Problem | (1943) | Description / Buy at Amazon |
| This World of 1949 and What to Do About It | (1948) | Description / Buy at Amazon |
| A Personal Jesus | (1954) | Description / Buy at Amazon |
| Spirits in American Literature | (1955) | Description / Buy at Amazon |
| My Lifetime in Letters | (1960) | Description / Buy at Amazon |
| The Autobiography of Upton Sinclair | (1962) | Description / Buy at Amazon |
| The Secret Life of Jesus | (1962) | Description / Buy at Amazon |
| The Brass Check | (1970) | Description / Buy at Amazon |
| Biographical and Critical Opinions | (1973) | Description / Buy at Amazon |
| Mammonart | (1975) | Description / Buy at Amazon |
| Upton Sinclair Presents William Fox | (1976) | Description / Buy at Amazon |
| Upton Sinclair: Four Unpublished Letters | (1984) | Description / Buy at Amazon |