Dr Knight assisted with more than 2000 births over his career.
"We enjoyed it so much and made so many friends we stayed 50 years. Tokoroa was a booming South Waikato timber town with a young population of 19,000 and a high birth rate. My work in general practice was busy and challenging with accident, police, obstetric and hospital anaesthetic work.
"I have had a long and eventful medical journey in Tokoroa with some quite exceptional colleagues.
"It was a journey I could not have made without the support of my loving wife Judith, my patients' best advocate."
He was also the president of the Rotary Club of Tokoroa.
Dr Knight said he had "absolutely no idea" he had been nominated for the Queen's Service Medal and was "shocked, deeply moved but delighted" to receive it.
"This medal will always remind me of Tokoroa , a town and community we loved in the 1960s - always have, and still do."