1921
- January 31
- New Zealand’s first regular airmail service begins between Christchurch, Ashburton and Timaru.
- February 15
- Radio Society of Christchurch formed.
- April 1
- Spreydon Borough joins City.
- July 30
- Canterbury becomes the first New Zealand provincial rugby team to defeat the Springboks.
- November 1
- Woolston Borough joins City.
- (no date)
- Concert by violinist Jascha Heifetz.