Gwyneth Paltrow wants to have another child — to honour her father.

The 'Iron Man' actress, who has two children with her husband Chris Martin, says her father had always regretted having only two children.

Paltrow's director father Bruce died of cancer in 2002.

"I may force myself to do it one more time because the result is so worth it," she told Harper's Bazaar magazine.

"And also my dad said to me that his only regret in life was that he had only two children and he didn't have more."

Paltrow and Coldplay singer Martin have also thought about adopting.

"I do feel we're so fortunate, and we kind of owe it to humanity. We have a lot of love to give and a lot of resources."

The couple are parents to Apple (four) and one-year-old Moses.

Paltrow also revealed her new haircut was traumatic because hair was cut off that she's had since her dad's death.

"I was very, very attached to my hair. I grew it when I was pregnant. I still had hair from when my father was alive. I made it like a talisman. And then I was ready to let go of it, and so I chopped it off and ... aaah!"