A woman who once served in the nursing branch of the Royal Air Force has left £100,000 in her will to The James Cook University Hospital.
Susan Ethel Sutcliffe of Linthorpe, Middlesbrough, left the bequest to the renal unit in appreciation of the treatment given to her late husband Jack.
He had been treated for kidney stones and cancer of the kidneys.
Mrs Sutcliffe served in the Princess Mary's Royal Air Force Nursing Service.
She rose to the rank of wing officer - the equivalent of a wing commander.
Mrs Sutcliffe died aged 98 in August 2010.
It is believed the couple, who had no children, met while they were both serving in Palestine shortly after World War II.
Mrs Sutcliffe worked as a nurse and midwife at Leeds General Infirmary, but when she married she left nursing and moved to Middlesbrough where Mr Sutcliffe worked as a solicitor. He died in 2004.
She was also a long-time member of the Red Cross.
Renal clinical director and directorate manager Jo Flood said: "We are very grateful for this generous bequest which will benefit future kidney patients for years to come.
"The money has been put into the renal unit trust fund and will be used to improve and replace facilities that directly impact on patient experience such as blood pressure machines, patient recliners and televisions which need replacing every two years due to constant usage."