Iron ore is any rock or mineral from which iron can economically be extracted. Iron ore comes in a variety of colors, including dark gray, bright yellow, deep purple, and rusty red. The iron comes in the form of iron oxides such as magnetite, hematite, limonite, goethite, or siderite. Economically viable forms of iron ore contain between 25% and 60% iron. In the old days of mining, some ores had 66% iron and could be fed into iron-making blast furnaces directly. These were known as "natural ores."

The three primary sources of iron ore are banded iron formations, magmatic magnetite ore deposits, and hematite ore. The most iron ore is extracted from banded iron formations, geological structures laid down mostly between 3 and 1.2 billion years ago. Blue-green algae released oxygen in the days when the atmosphere and oceans were very oxygen-poor, binding together with dissolved iron in the world's oceans. These iron fixation events went through cycles as the algae had alternating blooms and busts, leaving the characteristic bands seen in banded iron formations. The iron ore is in either the form of magnetite or hematite. Banded iron formations are found on all continents, but especially rich deposits are found in Australia, Brazil, and the United States.

Another prominent source of iron ore is found as magmatic magnetite iron ore deposits, formed during ancient volcanic eruptions which released large amounts of magnetite which layer crystalized. Granite-associated deposits have been found in places like Malaysia and Indonesia which require very little post-processing to extract the iron. Titanomagnetite, a special class of magmatic magnetite iron ore, also serves as a source of titanium and vanadium, which is extracted via specialized smelters.

A third source of iron ore is in hematite ore deposits, which are found on all continents, especially in Australia, Brazil, and Asia. Most hematite ore originates from banded iron formations that have undergone chemical alteration over billions of years due to hydrothermal fluids. The world's largest producer of iron ore, Vale, located in Brazil, utilizes hematite ore. Vale produces 15% of the entire world's iron supply. In total, worldwide iron ore production is about one billion metric tons.