Jane Carey-Harris, a former theatre nurse, has been given the title in recognition of her contribution to military nursing.
The appointment of Queen’s Honorary Nurse falls to only two army nurses at a time, one regular and one reserve.
The current regular incumbent is Colonel Pete Childerley, director of army nursing.
Ms Carey-Harris took up the reserve appointment on 1 March.
The duties of the Queen’s honorary nurse are mainly of a representational nature and include, for example, attendance at investitures and other formal events where the Queen is present.
Ms Carey-Harris has served in the Territorial Army since 1977 and was the senior theatre sister with 34 Field Hospital on its deployment to Iraq in 2003.
She was promoted to colonel in 2010 and is commanding officer of 306 Hospital Support Medical Regiment (Volunteers). She is also currently assistant director of transition for NHS South West London.
NHS London chief nurse Trish Morris-Thompson said: “We are very proud of Jane’s achievement in being appointed as one of two honorary nurses to the Queen.
“This accolade is testament to Jane’s dedication to the nursing profession and expertise in her field, and her work should be held up as an example to follow of the high quality of care, compassion and dedication we expect of all our nurses in London.”