She said it was "absolutely awful" that bystanders filmed attacks on officers and uploaded them to the internet without intervening.
The Met Commissioner was speaking on Nick Ferrari LBC radio show today and asked people to do more to help police officers in need.
Her plea came after a video of a police officer being assaulted with a flying kick was captured on a mobile phone and then circulated on social media.
She said: "What we seem to be seeing now is not only police officers being assaulted, but sometimes crowds gathering and then some people filming, laughing, joking."
"Officers getting assaulted and people thinking that's funny, putting it on the internet I think is disgusting."
"I think I want to live in a society and I think I do live in a society where we have active citizens, where people stand up and say 'that's not right, don't do that', or on occasion, even, if they feel able, get involved and do something physically."
She added: "I do not want people taking crazy risks but we want to see people getting involved."
During the interview, Dick defended the deployment of armed officers to help deal with a large increase in knife crime across the capital.
She said there were "very limited circumstances" where the use of such tactics was appropriate.
And as soon as a bystander gets involved they are subject to prosecution by the very police they are attempting to help. That's how it can happen.
I actually empathise with the police. It's policy that is the problem, both state and institution.
If budget cuts mean there are only two or three police officers attending an incident that requires many more then 'incidents' are going to happen. It's not up to the public who aren't trained on restraint techniques and are equipped with spray and buttons etc to "step in and help".