MSCI Inc. (formerly Morgan Stanley Capital International) is an American finance company headquartered in New York City. MSCI is a global provider of equity, fixed income, real estate indices, multi-asset portfolio analysis tools, ESG and climate finance products. It operates the MSCI World, MSCI Emerging Markets, and MSCI All Country World (ACWI) indices, among others.

The company is headquartered at 7 World Trade Center in Manhattan. Its business primarily consists of licensing its indices to index funds, such as exchange-traded funds (ETFs), which pay a fee of around 0.02 to 0.04 percent of the invested volume for the use of the index. As of 2025,^[update] funds worth over 16.5 trillion US$ were based on MSCI indices.

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 indices from Capital International and branded the indices as the Morgan Stanley Capital International (MSCI) indices. By the 1980s, the MSCI indices were the primary benchmark indices outside of the U.S. 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 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 include Glass Lewis, Factset, Sovereign Wealth Fund Institute, and S&P.

In 2010 MSCI acquired RiskMetrics Group, Inc. and Measurisk.

In 2012 MSCI acquired Investment Property Databank.

In 2013, MSCI acquired Investor Force from ICG Group (formerly Internet Capital Group).

In August 2014, MSCI acquired GMI Ratings.