The umbrella body the Women’s Resource Centre has had its website hacked by people who claim to support the militant Islamic group Isis.
The charity’s home page, which was targeted last week, was replaced by a message saying "I love ISIS and jihad" and "je suis ISIS", along with a promotional video.
The charity has removed the page and replaced it with a holding page, but has been unable to restore the site to working order.
Vivienne Hayes, chief executive of the WRC, said the charity had no idea why it had been targeted.
"Our work is nationally based and we have no international links," she said. "It is unbelievable to think that we must be guarded against terrorist activity while already struggling against the effects of austerity that face all women’s organisations."
The page was hacked in the name of a group called Team System DZ, which last year was apparently responsible for hacking a number of seemingly unconnected websites, including that of the rugby league team the Keighley Cougars.