In microeconomics, management and international political economy, vertical integration is a term that describes the arrangement in which the supply chain of a company is integrated and owned by that company. Usually each member of the supply chain produces a different product or (market-specific) service, and the products combine to satisfy a common need. It contrasts with horizontal integration, wherein a company produces several items that are related to one another. Vertical integration has also described management styles that bring large portions of the supply chain not only under a common ownership but also into one corporation (as in the 1920s when the Ford River Rouge Complex began making much of its own steel rather than buying it from suppliers).

Vertical integration and expansion is desired because it secures supplies needed by the firm to produce its product and the market needed to sell the product. Vertical integration and expansion can become undesirable when its actions become anti-competitive and impede free competition in an open marketplace. Vertical integration is one method of avoiding the hold-up problem. A monopoly produced through vertical integration is called a vertical monopoly. Vertical in a supply chain measures a firm's distance from the final consumers; for example, a firm that sells directly to the consumers has a vertical position of 0, a firm that supplies to this firm has a vertical position of 1, and so on.