| Ida Willis | |
| Birth Date: | 29 December 1881 |
| Birth Place: | Wellington, New Zealand |
| Death Place: | Raumati Beach, New Zealand |
| Allegiance: | New Zealand |
| Branch: | New Zealand Military Forces |
| Serviceyears: | 1914–1946 |
| Rank: | Matron-in-Chief |
| Commands: | New Zealand Army Nursing Service (1933–46) |
| Battles: | First World War Second World War |
| Awards: | Officer of the Order of the British Empire Associate Royal Red Cross Mentioned in Despatches (2) |
Lizzie Ida Grace Willis (29 December 1881 - 7 March 1968) was a notable New Zealand civilian and military nurse, hospital inspector, matron, army nursing administrator.
Willis was born in Wellington, New Zealand, in 1881. She was a nurse at Wellington Hospital. In August 1914, she was one of six nurses who went with the expeditionary force that took over German Samoa. In July 1915, she was a sister on the hospital ship, Maheno. In 1916 she was working in the New Zealand Army Nursing Service (NZANS) in France.[1]
In the 1918 New Year Honours, Willis was appointed an Associate of the Royal Red Cross. In 1935, she was awarded the King George V Silver Jubilee Medal.[2] She was appointed an Officer of the Order of the British Empire (Military Division) in the 1944 New Year Honours, in recognition of her service as matron-in-chief of the New Zealand Army Nursing Service.