Lincolnshire Police have been informed of a number of shed breaks in Chapel St Leonards recently.
The breaks were reported on Sunday, May 25 and four bicycles were stolen.
The external caravan storage sheds were broken into at the Golden Palms caravan site on South Road, Chapel St Leonards.
Police cannot be sure exactly when the bikes were stolen due to them being locked away for some time.
Two pink bikes, one red bike and one black bike were stolen.
The make and model of the bikes has not been given.
If anyone has any information relating to the stolen bicycles, contact Lincolnshire Police on 101, quoting incident number 320 of May 25.
Crimes can also be reported anonymously by calling crimestioppers on 0800 555 111.