We know that dinosaurs existed because we have fossil records. If they existed, then they were created by God during the time when God created all animals:

And God said, “Let the land produce living creatures according to their kinds: livestock, creatures that move along the ground, and wild animals, each according to its kind.” And it was so. God made the wild animals according to their kinds, the livestock according to their kinds, and all the creatures that move along the ground according to their kinds. And God saw that it was good. Genesis 1:24-25

Dinosaurs were a “kind” of animal, a “creature.” The question is when did they live and when did they die. While evolution is not supported in the Bible, the timeline of whether dinosaurs existed before or during the existence of man is the big debate.

The Bible has a possible clue that dinosaurs lived during the time of Job, described in Job 40:15-41:34. The animals described here are huge.

The behemoth could be a brontosaurus, grazing on grass, or an elephant. The terms has a wide range of use.

The leviathan could be a stegosaurus or a hippopotamus or, some say, a dragon (Job 41:18-21). As you can tell, it’s quite unclear.

Others believe the dinosaurs made it on the ark, in the form of small babies, while other believe the flood of Noah wiped them out. Dinosaurs certainly fit into the creation account, but their timeline is unclear.