Nexen to Webcast Investor Day

Market Wire, June, 2009

Nexen Inc. will hold its 2009 Investor Day on Thursday, June 18, 2009 in Banff, Alberta, Canada. Nexen senior management will provide an update on our strategy and operations in each of our key regions including Long Lake, Horn River, the North Sea, Offshore West Africa, the Gulf of Mexico, and other international areas.

To accommodate a wider audience, all presentations will be webcast. Links to the audio webcast and presentation slides will be available on June 18th at www.nexeninc.com .

Presentations will begin at 7:35 am Mountain Time (9:35 am Eastern Time). A detailed schedule of presentations will be available on our website on June 17th.

We recommend users access the webcast approximately 10 minutes before the scheduled start time. A webcast archive and audio transcript will be available within 48 hours of the presentations and will be available on our website.

Nexen Inc. is an independent, Canadian-based global energy company, listed on the Toronto and New York stock exchanges under the symbol NXY. We are uniquely positioned for growth in the North Sea, Western Canada (including the Athabasca oil sands of Alberta and unconventional gas resource plays such as shale gas and coalbed methane), deep-water Gulf of Mexico, offshore West Africa and the Middle East. We add value for shareholders through successful full-cycle oil and gas exploration and development and leadership in ethics, integrity, governance and environmental protection.

Contacts: Lavonne Zdunich, CA Manager, Investor Relations (403) 699-5821 Tim Chatten, P.Eng Analyst, Investor Relations (403) 699-4244 Nexen Inc. 801 - 7th Ave SW Calgary, Alberta, Canada T2P 3P7 Website: www.nexeninc.com