Authors with 10 or more pseudonyms

150Crowley, Edward Alexander [1875-1947]
68Paine, Lauran [1916-]
57Rowland, Donald S(ydney) [1928-]
45Tubb, E(dwin) C(harles) [1919-]
39Fearn, J(ohn) R(ussell) [1908-1960]
33Kaser, Arthur Leroy [1890-1956]
32Silverberg, Robert [1935-]
27Bingley, David Ernest [1920-]
27Creasey, John [1908-1973]
27Norwood, Victor George Charles
25Ellison, Harlan (Jay) [1934-]
21Bulmer, (Henry) Kenneth [1921-]
21Garrett, (Gordon) Randall (Phillip David) [1927-1987]
21Simenon, Georges [1903-1989]
20Fanthorpe, Robert L(ionel) [1935-]
20Faust, Frederick Schiller [1892-1944]
20Kornbluth, C(yril) M. [1924-1958]
19Avallone, Michael (Angelo) [1924-1999]
18Graham, Roger Phillips [1909-1965]
18Kuttner, Henry [1914-1958]
17Bradbury, Ray(mond Douglas) [1920-]
17de Los Uerdes, Ramón Felipe ... Alvarez-del Rey [1915-1993]
17Rotsler, William [1926-]
16Ballard, Willis Todhunter [1903-1980]
16Glasby, John S(tephen) [1928-]
16Gorey, Edward (St. John) [1925-]
16Lowndes, Robert (Augustine) W(ard) [1916-]
16Pohl, Frederik (George) [1919-]
14Bixby, (Drexel) Jerome (Lewis) [1923-1998]
14Floren, Lee
14Ross, William E. Daniel
13Bedford-Jones, H(enry James O'Brien) [1887-1949]
13Lovecraft, H(oward) P(hillips) [1890-1937]
13Nicole, Christopher (Robin) [1930-]
13Shaver, Richard S(harpe) [1907-1975]
12Ackerman, Forrest J(ames) [1916-]
12Budrys, Algirdas Jonas [1931-]
12Burge, Milward Rodon Kennedy [1894-1968]
12Butterworth, William Edmund [1929-]
12Farmer, Philip José [1918-]
12Harknett, Terry Williams [1936-]
12James, Laurence [1942-]
12Rathbone, St. George (Henry) [1854-1938]
12Snow, Charles H(orace) [1877-1967]
12Stratemeyer, Edward L. [1862-1930]
11Harvey, John B. [1938-]
11Keevil(l), Henry John [1914-1978]
11Koontz, Dean (Ray) [1945-]
11Smith, Trevor Dudley [1920-1995]
11Whittington, Harry Benjamin [1915-1989]
11Zachary, Hugh [1928-]
10Fairman, P(aul) W. [1916-1977]
10Harris, John Wyndham Parkes Lucas Beynon [1903-1969]
10Heckelmann, Charles N(ewman) [1913-]
10Kneller, F(rank) C.
10Tralins, (S.) Robert
10Wollheim, Donald A(llen) [1914-1990]