The group of women, who said they were wearing blue as a symbol of hope, stood holding hands for five minutes on Westminster Bridge as Big Ben chimed 4pm.
The event was organised by Women’s March On London as people from a range of backgrounds joined the event.
Sarah Waseem, 57, from Surrey, said: ‘When an attack happens in London, it is an attack on me.
‘It is an attack on all of us. Islam totally condemns violence of any sort. This is abhorrent to us.’
Being present for the demonstration shows people in the city are united in support of democracy, said Ayesha Malik.
The 34-year-old mother-of-two, also from Surrey, said: ‘As a visible Muslim I think it was important to show solidarity with the principles that we all hold dear, the principles of plurality, diversity and so on.’
Londoner Mary Bennett said she was present to make a ‘small gesture’.
The retired healthcare worker said: ‘I am here to show that in a quiet way we continue to go where we like and do what we like in London.
‘This is my city. It’s a very small gesture but life is made up of small gestures.’
See photo below