The following guest authors are confirmed for Alpha 2018:
|Tamora Pierce||N. K. Jemisin||Mary Robinette Kowal||Maggie Stiefvater|
|From author website||By Laura Hanifin||From author website||By Sadichhak|
- Tamora Pierce, bestselling author of the Song of the Lioness quartet, the Circle of Magic series, and many other fantasy novels
- N. K. Jemisin, Hugo and Nebula Award-winning author of The Fifth Season, The Hundred Thousand Kingdoms, and other novels and short stories
- Mary Robinette Kowal, Hugo Award-winning author of the acclaimed Glamourist Histories series, Ghost Talkers, and Word Puppets
- Maggie Stiefvater, bestselling author of the Raven Cycle series, All the Crooked Saints, The Scorpio Races, and other novels for young adults
Past author guests include John Joseph Adams, Michael Arnzen, Catherine Asaro, Holly Black, Tobias S. Buckell, Lawrence C. Connolly, Bruce Coville, Amal El-Mohtar, Timons Esaias, Charles Coleman Finlay, Carl Frederick, James Frenkel, Gregory Frost, Max Gladstone, Theodora Goss, Alan Irvine, Alaya Dawn Johnson, Kij Johnson, Scott A. Johnson, Michael Kandel, Ellen Kushner, Justine Larbalestier, David Levine, Malinda Lo, Christopher McKitterick, E. C. Myers, Daniel José Older, Tamora Pierce, Bruce Holland Rogers, Delia Sherman, Wen Spencer, Rachel Swirsky, William Tenn, Harry Turtledove, Catherynne M. Valente, Scott Westerfeld, Leslie What, Sheila Williams, Alyssa Wong, and Timothy Zahn.