Nasdaq Nordic is the common name for the subsidiaries of Nasdaq, Inc. that provide financial services and operate marketplaces for securities in the Nordic and Baltic regions of Europe.

Historically, the operations were known by the company name OMX AB (Aktiebolaget Optionsmäklarna/Helsinki Stock Exchange), created in 2003 with the merger between OM AB and HEX plc. In 2015, the legal entity OMX AB was renamed Nasdaq AB, but it also operates under the name Nasdaq OMX AB. The operations have been part of Nasdaq, Inc. (formerly known as Nasdaq OMX Group) since February 2008.

On 23 August 2023, the company formed EuroCTP as a joint venture with 13 other bourses, in an effort to provide a consolidated tape for the European Union, as part of the Capital Markets Union proposed by the European Commission.

OM AB (Optionsmäklarna) was a futures exchange founded by Olof Stenhammar in the 1980s to introduce trading in standardized option contracts in Sweden. OM acquired the Stockholm Stock Exchange in 1998 and unsuccessfully attempted acquisition of the London Stock Exchange in 2001. During the dot-com bubble in the early 2000s, OM, together with investment bank Morgan Stanley Dean Witter, launched a virtual European stock exchange called Jiway. The project was not successful and was cancelled on 14 October 2002.

On 3 September 2003, the Helsinki Stock Exchange (HEX) merged with OM and the joint company became OM HEX. On 31 August 2004, the company name was changed to OMX. OMX then acquired the Copenhagen Stock Exchange in January 2005 for €164 million. On 19 September 2006, Iceland Stock Exchange owner Eignarhaldsfelagid Verdbrefathing (EV) announced it would be acquired by OMX in a deal valuing the company at 250 million SEK. The transaction was completed by the end of the year.

The company took a 10% stake in Oslo Børs Holding ASA, the owner of the Oslo Stock Exchange in October 2006. As of September 2016, Nasdaq is not a major shareholder in the Oslo Stock Exchange holding company, which following a merger is currently called Oslo Børs VPS Holding ASA. Nasdaq has, however, publicly stated its interest in eventually acquiring the Oslo Stock Exchange.

In November 2007, OMX acquired the Armenian Stock Exchange and the Central Depository of Armenia.

In December 2005, OMX started First North, an alternative exchange for smaller companies, in Denmark. The First North exchange expanded to Stockholm in June 2006, Iceland in January 2007 and Helsinki in April 2007. The Markets Technology division of Computershare was acquired in 2006. The acquisition greatly expanded its product offerings and made its client list the largest of all trading system technology providers.^{[citation needed]}