The Institute of Directors has called on companies to put more women on boards in 2012.
In his New Year's message, director-general Simon Walker stressed there were "still too few women in the boardroom".
The IoD's seven main board directors are all men.
Meanwhile, Tesco director Lucy Neville-Rolfe said: "In the past four years, the number of female directors in Tesco's businesses around the world is up 70% to 103."