Cantos Ventures is a San Francisco-based venture capital firm founded in 2016 by angel investor Ian Rountree. The firm focuses on pre-seed and seed-stage investments in deeply technical startups, particularly in the climate, TechBio, aerospace, and next-generation computing sectors. Cantos Ventures aims to support "near frontier" companies that have the potential to address significant global challenges, including climate change, disease, armed conflict, poverty, and existential risks.

The firm has invested in over 50 deep tech startups to date, with notable investments such as Astranis, Atom Computing, Faeth Therapeutics, Fleetzero, Humane, Mission Barns, Radiant, Skyryse, Solugen, Twelve, and Venus Aerospace. In September 2022, Cantos Ventures raised $50 million for its third fund, continuing its commitment to backing innovative startups that can make a meaningful impact on the world. The firm's investment philosophy centers on partnering with technical founders who are tackling some of the world's most pressing problems, believing that science-forward companies are key to improving billions of lives and stewarding the planet.