Tarzan Series 

1. Tarzan of the Apes (1912/1914) 
2. The Return of Tarzan (1913/1915) 
3. The Beasts of Tarzan (1914/1916) 
4. The Son of Tarzan (1915/1917) 
5. Tarzan and the Jewels of Opar (1915/1918) 
6. Jungle Tales of Tarzan (1917/1919) 
7. Tarzan the Untamed   (1919/1920) 
8. Tarzan the Terrible (1920/1921) 
9. Tarzan and the Golden Lion (1922/1923) 
10. Tarzan and the Ant Men (1923/1924) 
11. The Tarzan Twins (juvenile, 1927/1927) 
12. Tarzan, Lord of the Jungle (1927/1928) 
13. Tarzan and the Tarzan Twins with Jad-Bal-Ja, the Golden Lion (juvenile, 1928/1936) 
14. Tarzan and the Lost Empire (1928/1929) 
15. Tarzan at the Earth's Core (1929/1930) 
16. Tarzan the Invincible (1930/1931) 
17. Tarzan Triumphant (1931/1932) 
18. Tarzan and the Leopard Men (1931/1935) 
19. Tarzan and the City of Gold (1932/1933) 
20. Tarzan and the Lion Man (1933/1934) 
21. Tarzan's Quest (1935/1936) 
22. Tarzan the Magnificent (1937/1939) 
23. Tarzan and the Forbidden City (1937/1938) 
24. "Tarzan and the Jungle Murders" (1939/1965)* 
25. "Tarzan and the Champion"  (1939/1965)* 
26. Tarzan and the Madman (1940/1964) 
27. "Tarzan and the Castaways" (1940/1965)* 
28. Tarzan and "The Foreign Legion"(1944/1947) 
29. "Unnamed Tarzan Novel" (1946, unfinished) 

* included in Tarzan and the Castaways (1965) 

Martian Series 

1. A Princess of Mars   (1911/1917) 
2. The Gods of Mars   (1912/1918) 
3. The Warlord of Mars   (1913/1919) 
4. Thuvia, Maid of Mars   (1914/1920) 
5. The Chessmen of Mars (1921/1922) 
6. The Master Mind of Mars (1925/1928) 
7. A Fighting Man of Mars (1929/1931) 
8. Swords of Mars (1933/1936) 
9. Synthetic Men of Mars (1938/1940) 
10. Llana of Gathol (1940/1948) 
11. "Skeleton Men of Jupiter" (1941/1964, included with "John Carter and the Giant of Mars" by John Coleman Burroughs in John Carter of Mars. ) 

Pellucidar (Earth's Core) Series 

1. At the Earth's Core (1913/1922) 
2. Pellucidar  (1915/1923) 
3. Tanar of Pellucidar  (1928/1930) 
4. Tarzan at the Earth's Core (1929/1930) 
5. Back to the Stone Age (1935/1937) 
6. Land of Terror (1939/1944) 
7. Savage Pellucidar (1940,1944/1963) 

Venus (Amtor) Series 

1. Pirates of Venus (1931/1934) 
2. Lost on Venus (1932/1935) 
3. Carson of Venus (1937/1939) 
4. Escape on Venus (1940/1946) 
5. "The Wizard of Venus" (1941; in Tales of Three Planets, 1964)

Western Stories

1. "For the Fool's Mother" (1912; in Forgotten Tales of Love and Murder, 2000)
2. The Bandit of Hell's Bend (1923/1925) 
3. The War Chief (1926/1927) 
4. Apache Devil (1927/1933) 
5. The Deputy Sheriff of Comanche County (1930/1940) 

"Realistic" Works 

1. The Girl from Farris's (1916/1965) 
2. The Efficiency Expert (1921/1966) 
3. The Girl from Hollywood (1922/1923) 
4. Marcia of the Doorstep (1924/1999) 
5. You Lucky Girl (play) (1927/1999) 

Science Fiction, Fantasy, Adventure, and Miscellaneous Works 

1. Minidoka: 937th Earl of One Mile (1905?/1998)
2. "Jonathan's Patience" (date unknown; in Forgotten Tales of Love and Murder, 2000) 
3. "The Avenger" (1912; in Forgotten Tales of Love and Murder, 2000) 
4. The Outlaw of Torn, 1912/1927 
5. The Monster Men (1913/1929)
6. The Cave Girl (1913 & 1914/1925) 
7. The Eternal Lover (1913 & 1914/1925; aka The Eternal Savage) 
8. The Mad King (1913 & 1914/1926) 
9. "The Man-Eater" (1915; in Beyond Thirty and The Man-Eater, 1957) 
10. "Beyond Thirty" (1915; in Beyond Thirty and The Man-Eater; aka The Lost Continent) 
11. "The Rider" (1915; in The Oakdale Affair and The Rider, 1937) 
12. The Mucker (1913, including "The Return of the Mucker" 1916/book 1921) 
13. "The Oakdale Affair" (1917; in The Oakdale Affair and The Rider, 1937) 
14. "The Little Door" (1917; in Forgotten Tales of Love and Murder, 2000) 
15. The Land that Time Forgot (includes "The Land that Time Forgot," 1917; "The People that Time Forgot," 1918; and "Out of Time's Abyss," 1918; book, 1924) 
16. "Beware!" (1922; aka "The Scientists' Revolt") 
17. The Moon Maid (includes "The Moon Maid," 1922; "The Moon Men," 1917 & 1922; "The Red Hawk," 1925; book, 1926) 
18. Jungle Girl (aka The Land of Hidden Men 1929/1932)
19. "Calling All Cars" (1931; in Forgotten Tales of Love and Murder, 2000) 
20. "Pirate Blood," (1932, in The Wizard of Venus, 1970)
21. "Elmer" (1936; in Forgotten Tales of Love and Murder, 2000; aka "The Resurrection of Jimber-Jaw," in Tales of Three Planets, 1964) 
22. The Lad and the Lion (1914 & 1937/1938) 
23. "Mr. Doak Flies South" (1938)
24. "Angel's Serenade" (1939)
25. "The Strange Adventure of Mr. Dinnwiddie" (1940; in Forgotten Tales of Love and Murder, 2000) 
26. "Beyond the Farthest Star" (1940; in Tales of Three Planets, 1964)
27. "Tangor Returns" (1940; in Tales of Three Planets, 1964)
28. "Misogynists Preferred" (1941; in Forgotten Tales of Love and Murder, 2000) 
29. "Uncle Miner and Other Relatives" (1941) 
30. I am a Barbarian (1941/1967)
31. "More Fun! More People Killed" (1943; aka "Night of Terror")
32. "Uncle Bill" (1944; in Forgotten Tales of Love and Murder, 2000)