What is Leviathan in the Bible? Is it Satan, an animal, or a symbol?

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Short answer

Leviathan is the Bible's great sea creature, and Scripture treats it with a striking double vision: a creature completely beyond human power, and completely under God's. It is named five times (Job 3:8; Job 41:1; Psalms 74:14; Psalms 104:26; Isaiah 27:1), and the wider dragon-of-the-sea language runs further (Job 26:12–Job 26:13; Psalms 89:9–Psalms 89:10; Isaiah 51:9; Ezekiel 29:3; Ezekiel 32:2).

The tenses tell the story: at creation the great sea creatures are simply made, and called good (Genesis 1:21); to Job, Leviathan is untamable (Job 41:1); to the psalmist, God formed it to play (Psalms 104:26) and has already crushed its heads (Psalms 74:13–Psalms 74:14); and Isaiah promises a slaying still future, in that day the LORD will slay the dragon of the sea (Isaiah 27:1). Revelation gathers the thread into one figure: the great dragon, the ancient serpent, identified as the devil (Revelation 12:9; Revelation 20:2), bound and finally ended (Revelation 20:10). Who or what Leviathan ultimately is remains a real interpretive question, the main views are below, none endorsed.

Question

What is Leviathan in the Bible? Is Leviathan Satan, a real animal, or a symbol?

Analysis

Two word-links that hold the thread together

These are checkable in the tagged Hebrew text, not impressions:

The same rare title. Job 26:13 and Isaiah 27:1 use the identical Hebrew phrase for "the fleeing serpent" (nachash bariach), one poem says God's hand pierced it, the other that God will yet punish it.
The dragon is a creature-word. The word for "the dragon of the sea" in Isaiah 27:1 (tannin) is the very word for the great sea creatures God makes on the fifth day (Genesis 1:21). Whatever Leviathan is, its own name files it among things God made.

The arc, in tenses

Made, and called good (Genesis 1:21). Scholars have long contrasted this with Babylonian creation stories, where the world is built from a slain sea-dragon: in Genesis there is no battle at creation, the sea monsters are a day-five creature.
Beyond us, not beyond God (Job 41:1 and the whole chapter): no hook, no rope, no hope of taming it, the climax of God's answer to Job.
God's playmate (Psalms 104:26): the same terror, formed to frolic in the sea where ships pass.
Already crushed, sung in the past tense (Psalms 74:13–Psalms 74:14; the same victory language over Rahab in Psalms 89:10; Isaiah 51:9; Job 26:12).
Still to be slain, Isaiah's future tense: in that day, with his great sword (Isaiah 27:1). This verse carries no fulfillment stamp anywhere in the New Testament; it stands open.
Applied to empires. Ezekiel calls Pharaoh the great monster in the Nile (Ezekiel 29:3; Ezekiel 32:2), the sea-monster image put on a political power, the same move Revelation makes with its beast from the sea (Revelation 13:1, drawing on Daniel 7:3).
Named and ended. Revelation's dragon is called the ancient serpent, the devil and Satan (Revelation 12:9; Revelation 20:2), and in the recorded cross-reference data this app uses, the dragon verses link back to Eden's serpent (Genesis 3:1; Genesis 3:15), to Isaiah 27:1, and to Job 41:34 side by side: the tradition read the serpent of Eden and the dragon of the sea as one enemy. Its end comes at Revelation 20:10, and in the new creation there is no sea left to rise from (Revelation 21:1).

The main views

View	Position	Held by
A real creature, described poetically	Job's Leviathan is a mighty animal (crocodile and whale are the usual candidates), painted in awe-language.	Some traditional and literalist interpreters
The chaos-power symbol	Leviathan personifies the chaos the sea stood for across the ancient Near East; the biblical writers use the shared image while insisting the LORD alone rules it.	Most modern academic commentary
Satan	The serpent-dragon language finds its final referent in the devil, an identification made inside Scripture itself when Revelation names the dragon the ancient serpent (Revelation 12:9).	The dominant reading in Christian history

What the views share

No text ever presents Leviathan as God's rival. It is created (Genesis 1:21), bounded with the sea it lives in (Job 38:8–Job 38:11), defeated in the songs of the past, and appointed a defeat in the future (Isaiah 27:1; Revelation 20:10). The fear it embodies is real in every reading, and mastered in every reading.

Sources, trace every one

Every cited verse, in full. Tap any reference to open it in the reader.

Job 3:8bsb
May it be cursed by those who curse the day — those prepared to rouse Leviathan.
Job 41:1bsb
“Can you pull in Leviathan with a hook or tie down his tongue with a rope?
Psalms 74:14bsb
You crushed the heads of Leviathan; You fed him to the creatures of the desert.
Psalms 104:26bsb
There the ships pass, and Leviathan, which You formed to frolic there.
Isaiah 27:1bsb
In that day the LORD will take His sharp, great, and mighty sword, and bring judgment on Leviathan the fleeing serpent— Leviathan the coiling serpent— and He will slay the dragon of the sea.
Job 26:12bsb
By His power He stirred the sea; by His understanding He shattered Rahab.
Job 26:13bsb
By His breath the skies were cleared; His hand pierced the fleeing serpent.
Psalms 89:9bsb
You rule the raging sea; when its waves mount up, You still them.
Psalms 89:10bsb
You crushed Rahab like a carcass; You scattered Your enemies with Your mighty arm.
Isaiah 51:9bsb
Awake, awake, put on strength, O arm of the LORD. Wake up as in days past, as in generations of old. Was it not You who cut Rahab to pieces, who pierced through the dragon?
Ezekiel 29:3bsb
Speak to him and tell him that this is what the Lord GOD says: Behold, I am against you, O Pharaoh king of Egypt, O great monster who lies among his rivers, who says, ‘The Nile is mine; I made it myself.’
Ezekiel 32:2bsb
“Son of man, take up a lament for Pharaoh king of Egypt and say to him: ‘You are like a lion among the nations; you are like a monster in the seas. You thrash about in your rivers, churning up the waters with your feet and muddying the streams.’
Genesis 1:21bsb
So God created the great sea creatures and every living thing that moves, with which the waters teemed according to their kinds, and every winged bird after its kind. And God saw that it was good.
Psalms 74:13bsb
You divided the sea by Your strength; You smashed the heads of the dragons of the sea;
Revelation 12:9bsb
And the great dragon was hurled down — that ancient serpent called the devil and Satan, the deceiver of the whole world. He was hurled to the earth, and his angels with him.
Revelation 20:2bsb
He seized the dragon, that ancient serpent who is the devil and Satan, and bound him for a thousand years.

On contested questions we show every major view, attributed and cited, and pick no winner. Answers are synthesized from primary sources, truth you can trace, not opinion.