The OTC Bulletin Board or OTCBB is an electronic quotation system in the United States that displays real-time quotes, last-sale prices, and volume information for many over-the-counter (OTC) equity securities that are not listed on the NASDAQ Stock Market or a national securities exchange. Broker-dealers who subscribe to the system can use the OTCBB to look up prices or enter quotes for OTC securities.

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Although the NASD oversees the OTCBB, the OTCBB is not part of the Nasdaq Stock Market. According to the SEC, "fraudsters often claim or imply that an OTCBB company is a Nasdaq company to mislead investors into thinking that the company is bigger than it is."[1]

Companies quoted on the OTC Bulletin Board must be fully reporting (i.e. current with all required SEC filings) but have no market capitalization, minimum share price, Corporate governance or other requirements to be quoted. Companies which have been "de-listed" from stock exchanges for falling below minimum capitalization, minimum share price or other requirements often end up being quoted on the OTC Bulletin Board.