Vandals smashed the back window of one vehicle and scratched the entire passenger side of another parked in Deer Park Road, Langtoft.
Police are looking for witnesses to the incidents which happened overnight between Friday and Saturday.
Anyone with information should call 101 or Crimestoppers, anonymously, on 0800 555111, quoting incident 148 of December 13.
Meanwhile, police are looking for a gang who broke in through the front door of a house in Woburn Close, Market Deeping, at about 6.30am on December 2.
When calling police, quote incident 62 of December 2.