MSCI Inc. (formerly Morgan Stanley Capital International and MSCI Barra), is an American provider of equity, fixed income, hedge fund stock market indexes, and equity portfolio analysis tools. It publishes the MSCI BRIC, MSCI World and MSCI EAFE Indexes. The company is currently headquartered at 7 World Trade Center in Manhattan, New York City, U.S.

In 1968, Capital International published indices covering the global stock market for non-U.S. markets. In 1986, Morgan Stanley licensed the rights to the indexes from Capital International and branded the indexes as the Morgan Stanley Capital International (MSCI) indexes. By the 1980s, the MSCI indexes were the primary benchmark indexes outside of the US before being joined by FTSE, Citibank and Standard & Poor's. After Dow Jones started float weighting its index funds, MSCI followed. In 2004, MSCI acquired Barra, Inc., to form MSCI Barra. In mid-2007, parent company Morgan Stanley decided to divest from, and perhaps spin off, MSCI. This was followed by an initial public offering of a minority of stock in November 2007. The divestment was completed in 2009. The company is headquartered in New York City.

Some companies in MSCI's peer group includes Glass Lewis, Factset, Sovereign Wealth Fund Institute and Standard & Poor's.

MSCI formally acquired both RiskMetrics Group, Inc. and Measurisk in 2010, as well as Investment Property Databank in 2012. In 2013 MSCI acquired Investor Force from ICG Group (formerly Internet Capital Group) in 2013. In August 2014, MSCI acquired GMI Ratings.

The MSCI global equity indexes have been calculated since 1969 and include MSCI World and MSCI EAFE. Initially, the company used eight factors in developing its indexes: momentum, volatility, value, size, growth, size nonlinearity, liquidity and financial leverage.