1959 in comics

May

 * Hopalong Cassidy, with issue #135 (May/June cover-date), cancelled by DC.

August

 * August 11: Matt Baker dies at age 37.

October

 * Comic historian Alan J. Porter is born.

First issues by title

 * Kathy - Marvel Comics
 * A Date with Millie - Marvel Comics
 * Pilote magazine, featuring debuts of the series Astérix by René Goscinny and Albert Uderzo, and Michel Tanguy by Uderzo and Jean-Michel Charlier. (October 29)
 * Tales of Suspense - Marvel Comics
 * Tales to Astonish - Marvel Comics

DC Comics

 * Hal Jordan (Silver Age Green Lantern), in Showcase #22 (October)
 * Sgt. Rock in Our Army at War #81 (April)
 * Supergirl in Action Comics #252 (May)
 * Weather Wizard, in Flash #110 (December 1959/January 1960)