A Brooklyn actress who was mowed down last summer in a near-fatal collision with a bicyclist is suing the city for $3 million, claiming Prospect Park has become a hazard to pedestrians due to speeding cyclists.

Dana Jacks, 37, who recently was a cast member in a critically acclaimed Off-Broadway production of “Our Town,” said her crackup with cyclist David Sonenberg left her with brain trauma and face and skull fractures that kept her hospitalized for 25 days.

In her notice of claim, Jacks blames the city’s Parks Department and NYPD for their “negligent, careless and reckless” lack of traffic enforcement, court documents show.

“You don’t allow cars to race in the park; you shouldn’t allow bikes to race, either,” Jacks’ husband, Forrest Cicogni, said yesterday.

Three other pedestrians have been injured by bikers in the park since Jacks’ accident, according to the city.

Jacks had filed a separate lawsuit against Sonenberg, who countersued, claiming she was at fault for walking “unlawfully outside the crosswalk” and “knocking him to the ground.”

Additional reporting by Amber Sutherland, Cathy Burke