Ragnvald Blakstad (20 May 1866 – 26 April 1929) was a Norwegian industrialist and hydropower pioneer.
He was born to Erik Jørgensen Blakstad (1827–90) and Larine (Laura) Gabrielsen (1832–68).
In 1910, he acquired the majority of shares in the Tyssedal Hydroelectric Power Station (AS Tyssefaldene) and became director general of the company.
In these endeavors, he had to raise capital for acquisitions from outside parties including members of the Wallenberg family of Sweden including Marcus Wallenberg, Sr., founder of Stockholms Enskilda Bank.
In 1917, he co-founded The Norwegian Iron Works (De Norske Jernverker A/S), and followed up with plans for a steel and rolling mills in Risør.