A man grabbed a woman on Osborne Road and tried to carry her into a property in March.
Blackpool police say the incident happened at around 2:30pm on Saturday, March 16, when a woman has gone to an address on Osborne Road in South Shore to retrieve her property.
Officers are looking to speak to two members of the public who intervened when a man picked up the woman, against her will, and forcibly tried to carry her inside the building.
The two men helped the woman go free.
Det Con Sarah Moyles from Blackpool Police said: “It is these two men who we need to speak to as unfortunately, up until now we have been unable to trace them."
“If you think this was you, please get in touch with us at your earliest opportunity.”
Witnesses can call 01253 604141 or if you fail to get an answer, 101, quoting incident reference 767 of Saturday, March 16.