It happened at around 6.30pm in Cowling Brow, near to the Prince of Wales pub, and is understood to have involved the woman, 88, and a cyclist, 27.
Officers have appealed for anybody with information to call 101, quoting 1371 of Friday, May 4.
Pensioner badly hurt in crash with cyclist in Chorley
A pensioner is in a 'serious' condition after a collision in Chorley last night, police said.
By The Newsroom
Saturday, 5th May 2018, 10:25 am
Updated Saturday, 5th May 2018, 10:31 am