The latest report brings the total in Lincolnshire to 111.
A spokesman for United Lincolnshire Hospitals trust said: “Sadly we can confirm that three further patients who were being cared for in our hospitals, and had tested positive for COVID-19, have died.
“The patients were a woman aged 94 and two men aged 78 and 79. Both had underlying health conditions.
“Their families have been informed and our thoughts and condolences are with them at this difficult and distressing time.”
No new deaths were reported at Northern Lincolnshire and Goole Hospitals leaving the tally there at 72.
A further 204 people have died in England’s hospitals, bringing the total to 21,384.