The Bible presents us with the Nephilim and other giants, from whom Goliath was descended. When the tribes of Israel entered Canaan they had to confront giants.
Herotodus in his Persian Wars presents possible evidence for giants as well. In Book I.67-68 he tells of how the Spartans searched for the bones of Orestes, son of Agamemnon. A Spartan talks to an iron smith in the city of Tegea who tells him of a coffin he has found:
I came upon a coffin ten feet long. I had never believed that men were taller in the olden times than they are now, so I opened the coffin. The body inside was of the same length; I measured it, and filled up the hole again.
This indicates a widespread knowledge of giants in the “olden times” in lands outside of Israel.