55-year-old Alexandra Dryburgh left her home in Belton Grove, Grantham at around midday yesterday for a walk and has not been seen since.
This type of behaviour is extremely out of character for Mrs Dryburgh and police and her family are becoming increasingly concerned for her safety.
Mrs Dryburgh is described as white, around 5ft 1in tall and of medium build. She has hazel eyes and shoulder-length blonde/grey hair. She was last seen wearing a green v-neck sweater and dark grey jeans with a short double-breasted black coat.
Police are appealing for her to go to her nearest police station or to call the police on 101 or 999 as soon as possible to let people know she is safe and well. Officers are also asking anyone who sees her to get in touch with them as soon as possible via the 101 number.