A bronze-age hymn on the banks of the Indus calls for Indra to come down with rain. A medieval saga from Iceland describes Thor cracking a giant’s skull with Mjöllnir. Two gods. One sound: thunder. Indra is the Vedic king of the gods, wielder of the Vajra and lord of storms. Thor is the Norse champion of Midgard, protector of the common hall with his hammer Mjöllnir. Both descend from a single Proto-Indo-European storm god named *Perkwunos, but what their respective cultures did with that inheritance could not be more different.
We keep a library, not a pantheon. But when two thunder gods stand across the same Indo-European river, we trace both banks.
Where Do Indra and Thor Come From?
The earliest named texts for Indra are the Rigveda, composed between 1500 and 1200 BCE in the Punjab region. Indra appears in roughly 250 hymns more than any other deity. He is described as golden-jawed, bull-like, fuelled by soma. His weapon the Vajra was forged for him by the divine craftsman Tvashtr from the bones of the sage Dadhichi. This is not poetry for its own sake. The Vedas were recited at rain-begging sacrifices and cattle-raiding rites. Indra was the god a Vedic chieftain called on before battle.
Thor enters the written record much later. The earliest skaldic poems and the Poetic Edda were written down in thirteenth-century Iceland, though they preserve oral traditions from centuries earlier. Thor is the son of Odin (Othinn) and the earth goddess Jord. His hammer Mjöllnir was made by the dwarves Brokkr and Sindri after a bet with Loki. The Norse sagas and the Gesta Hammaburgensis Ecclesiae Pontificum by Adam of Bremen (c. 1070) describe Thor as the most beloved god of the common people: farmers, fishermen, settlers.
Both gods trace back to the same root. The nineteenth-century philologist Max Müller first proposed a common Aryan origin for storm gods. Later, Georges Dumézil, in his trifunctional hypothesis (first outlined in the 1930s), placed Indra and Thor in the second function: the warrior, the protector. Both are enforcers of cosmic order against chaos. But Dumézil also noted a key difference: Indra is also the king of the devas (souveraineté), whereas Thor never holds supreme kingship in Norse myth. That distinction matters.
How You Spoke to Each
Vedic ritual was precise. To call Indra, a priest (hotri) recited the hymns while pressing soma stalks with stones. The juice was offered into the fire (Agni) as a messenger. The key request: send rain, send cattle, send victory. The Brihaddevata, a later scholastic text, notes that Indra was invoked at the start of any expedition. The offering was not a vague plea. The phrase Indra jātaḥ appears in the Rigveda (10.119) when the god boasts of his own limitless power. Households did not have altars to Indra. He belonged to the tribal assembly and the battlefield.
Norse practice was closer to the bone. People wore small hammer amulets made of iron, silver, or amber. Over a thousand have been found in Scandinavian graves from the Viking Age (roughly 793–1066 CE). The Icelandic law text Grágás records that a woman could be exiled for wearing a hammer necklace after conversion to Christianity a sign it still held power. Thor was called upon for blessings at weddings and the hallowing of land. The Prose Edda by Snorri Sturluson (c. 1220) says Thor’s hammer was used to hallow the pyre of Baldr. The gesture was the same: a hammer raised above the head, tracing the shape of the cross. Christians noticed. They carved crosses over doors. Pagans carved hammers.
The difference in setting is telling. Indra was a god of armies and ritual specialists. Thor was a god of thresholds. You called on Thor when you stepped into a new hall. You called on Indra when you stepped onto a horse-headed chariot.
What the Vajra and Mjöllnir Actually Did
Indra’s Vajra is described in the Rigveda (1.32) as a golden weapon with a hundred joints and a thousand points. In the Mahabharata, it is made from the spinal bone of the sage Dadhichi. The weapon does not simply summon lightning. It shatters the clouds that hold back the waters. Indra kills the serpent Vritra, who had been blocking the rivers, and releases the cows and the dawn. The myth is agricultural, not just meteorological. Without the Vajra, no rain. Without rain, no harvest. Without harvest, no cattle.
Thor’s Mjöllnir works the other way. It kills giants (jötnar) to keep the world stable. In the Þrymskviða (Sayings of Thrym, from the Poetic Edda), Thor retrieves his hammer from the giant who stole it, then beats him to death with it at his own wedding feast. Mjöllnir also sanctifies: it hallows marriages, childbirth, and burials. The name itself probably means “crusher.” The thunder is the sound of the hammer hitting a giant’s skull.
Both weapons are made by non-god craftsmen and both are short-hafted (the dwarf Loki interfered, causing the handle to be too short). Both return to the wielder’s hand like a boomerang. These are not coincidences. They are echoes of a common motif: the storm god’s weapon is forged, not found.
Indra vs Thor: The Serpent Fight Both Won
Every Indo-European thunder god has a serpent enemy. Indra fights Vritra, a three-headed dragon that holds the waters. Thor fights Jörmungandr, the Midgard Serpent that encircles the world. The parallel is so sharp that Georges Dumézil used it as evidence for his hypothesis of a common narrative.
Indra kills Vritra with the Vajra after drinking three lakes of soma. The Rigveda (1.32) describes Vritra’s body bursting like a gourd split by lightning. Thor fights Jörmungandr twice: once when he goes fishing with the giant Hymir (the Poetic Edda’s Hymiskvitha), and once at Ragnarök, where they kill each other. The fishing scene is one of the most concrete images in Norse literature. Thor sits in Hymir’s boat, baits a hook with an ox head, and pulls the serpent’s poison-breathing head from the waves. Hymir cuts the line in terror. Thor nearly smashes him with the hammer.
Both myths are about holding back the chaos that threatens ordered life. Vritra blocks rivers. Jörmungandr encircles the world. The storm god breaks the barrier. Water flows. Life continues.
Why One King Fell and One Remained
Indra’s status in later Hinduism diminished. By the time of the Puranas (roughly 300–1000 CE), Indra had become a figure of cautionary tales: a god undone by pride, lust, and the curse of a sage. In the Ramayana, Indra is humiliated for sleeping with Ahalya, the wife of the sage Gautama. His body is covered in a thousand vulvae. The Brahmins and later the bhakti movement elevated Vishnu and Shiva to supreme positions. Indra became a regional rain lord, not a universal king.
Thor never fell. Christianity suppressed his worship but did not mythologize him as a fool. The conversion of Scandinavia in the 10th and 11th centuries saw Thor’s hammer slowly replaced by the cross, but the sagas never mock him. He remains blunt, honest, and effective. The Prose Edda, written by a Christian (Snorri), still treats Thor with respect. The thunder god tradition survived in folk belief well into the 19th century in rural Sweden and Norway, where people would make the sign of the hammer over butter churns and barn doors.
We are not making a value judgment here. We are observing that one tradition had a thousand years of continuous practice, while the other was recast by its own successors.
Common Misconceptions about Indra and Thor
“Thor is the Norse version of Zeus.” That is a superficial comparison based on thunder. Zeus is the king of the Greek gods, father of the pantheon, associated with law and hospitality. Thor is never the king. He is the defender. Indra is closer to Zeus in divine hierarchy (king of the devas), but his myths are more violent and less juridical.
“Indra is just a weather god.” He is a weather god, but also a war god, a fertility god, and a king. The Rigveda praises him for everything from rain to cattle to victory in battle. Reducing him to a meteorological function misses the point of the hymns.
“The Vajra is a lightning bolt.” It is a weapon that produces lightning, but in the texts it is a solid, metallic club or disc with joints. The Buddhist Vajrayana tradition later turned it into a ritual scepter symbolizing indestructible truth, not weather.
“Thor’s hammer was just a weapon.” Mjöllnir was primarily a weapon for killing giants, but it also hallowed. Norse law required the hammer’s presence at the consecration of boundaries and at the wedding ceremony where the bride was brought under the hammer’s sign. It was a tool of sacred space, not just a war club.
FAQ
Is Thor the same god as Indra? No. They share a common Proto-Indo-European ancestor, but they developed independently in cultures separated by two thousand kilometers and fourteen centuries.
What does the Vajra represent in Buddhism? In Buddhist tantra, the vajra (Tibetan dorje) represents the indestructible nature of reality. It is a ritual implement, not a weapon. The original Indra connection is symbolic.
Did Vikings pray to Thor for rain? Yes. Adam of Bremen (c. 1070) wrote that the Swedes at the temple of Uppsala prayed to Thor for fruitful seasons and peace. Rain was a prerequisite for crops.
Who would win in a fight, Indra or Thor? Mythological comparisons do not yield a winner. Both kill their respective world-serpents. Both are undone by no one except prophecy or their own flaws. The question is a modern parlor game, not a theological inquiry.
The Thunder Between Traditions
The Indo-European storm god did not survive as a unitary figure. He split, like a river branching into two different deltas. The Vedic hymns kept Indra’s kingship and his taste for soma. The Norse sagas kept Thor’s hammer and his proximity to the farmstead. We cannot read the Rigveda in a Viking longhouse. But we can stand at the root of the river and see both banks.
If this comparison interests you, explore our vertical hub on mythology for more divine parallels. Read about Perkwunos, the reconstructed ancestor of these gods in our glossary. Or go deeper with our guide to comparative Indo-European mythology.