More than seven people so far have reported their tires have been punctured due to pins.
It has been suggested that pins have been placed on the roads inside the park as a way to “attack” cyclists.
The events come amid a row over a proposed cycle superhighway, which would prevent access to drivers. This has led to an increase in “anti-cycling rhetoric” according to campaigners.
Justin McKie, chairman of Regent’s Park Cyclists, told the Standard: “This is clearly anti-cycling and what’s more I’m sure it’s an attack on Regent’s Park cyclists.
“The tacks are being placed by the side of the road where cyclists often ride, you wouldn’t do that for anyone else.
“The reality is this is extremely dangerous. Cyclists tend to travel at around 20mph and if you fall there is a chance you will break your collarbone or worse.
“It’s made worse by the fact it is happening in a busy park where you have cars coming in the opposite direction, bollards in the road and people stepping out.”