Vid Pecjak (7 January 1929 – 27 February 2016) was a Slovene author and psychologist.
Pecjak was born in Ljubljana, Slovenia.
He has written 90 books, two thirds from the field of psychology.
Most of his literary works are science fiction stories, novels, novelettes and also travel diaries and comic strip.
Some of his works were written under his pseudonym Div Kajcep (palindrome of his name).
Pecjak is perhaps best known for his SF novel for children and youth Drejcek in trije marsovcki (Drejcek and Three Little Martians) (1961), which concerns a little boy named Drejcek (Andy) who meets three little Martians.