The Quad Small Form-factor Pluggable (QSFP) is a compact, hot-pluggabletransceiver used for data communications applications.

The form factor and electrical interface are specified by a multi-source agreement (MSA) under the auspices of the Small Form Factor Committee. It interfaces networking hardware to a fiber optic cable or active or passive electrical copper connection. It is an industry format jointly developed and supported by many network component vendors, allowing data rates from 4×10 Gbit/s. The format specification is evolving to enable higher data rates; as of May 2013, highest possible rate is 4×28 Gbit/s (also known as QSFP28).