Arthur Koestler (1905-1983) marubuci ne kuma ɗan jarida ɗan Hungarian-British, wanda aka fi sani da ayyukansa akan siyasa, kimiyya, da kuma ilimin halin dan Adam. Ana kuma tunawa da shi saboda shiga yakin basasar Spain, inda ya yi yaki a bangaren jam'iyyar Republican da sojojin fasist na Janar Franco.A matsayin suna, kalmar "Arthur Koestler" yawanci tana nufin mutumin. kansa da aikinsa na rayuwarsa a matsayin marubuci, ɗan jarida, kuma ɗan gwagwarmayar siyasa. Hakanan yana iya komawa ga takamaiman ra'ayinsa na falsafa ko na siyasa, waɗanda galibi sukan kasance masu jayayya da muhawara a lokacin rayuwarsa. wanda ke raba wasu halaye na Koestler, kamar sha'awarsa ga siyasa, kimiyya, da ilimin halin ɗan adam, amfani da dabarun adabi don gano ra'ayoyi masu rikitarwa, ko shirye-shiryensa na ƙalubalantar gaskatawa da ƙa'idodi.