Sinai Ventures is a venture capital firm headquartered in Palo Alto, California, with additional offices in New York City and Tel Aviv. Established in 2017, the firm focuses on investing in software and internet companies at various stages of development. Their portfolio includes over 85 companies, such as Pinterest, Roman Health, and Hippo Insurance.

In November 2020, Sinai Ventures raised $500 million for its fund, marking the largest single fund in Los Angeles history at that time. The firm's mission is to support founders building impactful companies across the globe, leveraging its presence in key innovation hubs to provide strategic guidance and resources.