Oura Health Oy, operating as ŌURA, is a Finnish health technology company best known for the Oura Ring, a smart ring that tracks sleep, activity, stress, heart rate, temperature and other health metrics. The company was founded in Oulu, Finland, in 2013 by Petteri Lahtela, Kari Kivelä and Markku Koskela. Its headquarters is now in San Francisco, with its EU headquarters in Oulu and additional offices in Helsinki and San Diego. Tom Hale has served as chief executive since 2022.

The company sells its hardware directly to consumers and through retail and enterprise partners, and generates membership revenue from a paid subscription that unlocks additional features in its companion app. Its product line includes the Oura Ring 4 and the Oura Ring 5, launched in May 2026, which is 40% smaller than its predecessor. Recent software features include Health Radar, GLP-1 Insights, women's health tools such as Cycle Insights and Menopause Insights, and an AI advisor. The company has reported more than 5.5 million rings sold since its 2015 debut.

Oura has pursued enterprise and government business, including a $96.1 million contract from the US Defense Health Agency in 2024 for biometric sensor devices. Partnerships include Dexcom, Resmed, Cigna, Counsel Health, Team USA and the LA28 Games, and the Los Angeles Dodgers. The company reported revenue of more than $500 million in 2024 and expected sales above $1 billion in 2025.