Who hardened the Pharaoh's heart?

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God did.

And the LORD said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. Exodus 4:21

And I will harden Pharaoh's heart, and multiply my signs and my wonders in the land of Egypt. Exodus 7:3

And he hardened Pharaoh's heart, that he hearkened not unto them; as the LORD had said. Exodus 7:13

And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses. Exodus 9:12

And the LORD said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him. Exodus 10:1

But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go. Exodus 10:20

But the LORD hardened Pharaoh's heart, and he would not let them go. Exodus 10:27

And Moses and Aaron did all these wonders before Pharaoh: and the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go out of his land. Exodus 11:10

And I will harden Pharaoh's heart, that he shall follow after them; and I will be honoured upon Pharaoh, and upon all his host; that the Egyptians may know that I am the LORD. Exodus 14:4

And the LORD hardened the heart of Pharaoh king of Egypt, and he pursued after the children of Israel. Exodus 14:8

I will harden the hearts of the Egyptians, and they shall follow them: and I will get me honour. Exodus 14:18

The Pharaoh did.

But when Pharaoh saw that there was respite, he hardened his heart. Exodus 8:15

And Pharaoh hardened his heart at this time also, neither would he let the people go. Exodus 8:32

And when Pharaoh saw that the rain and the hail and the thunders were ceased, he sinned yet more, and hardened his heart, he and his servants. Exodus 9:34

Wherefore then do ye harden your hearts, as the Egyptians and Pharaoh hardened their hearts? 1 Samuel 6:6