Catherine Ann Andersen (née McHaffie; 1 August 1870 – 15 September 1957) was a New Zealand teacher, community leader and writer.

She was the older daughter of James McHaffie, a Scottish clerk, and Ellen Leatherbarrow, a Londoner.

The family moved to Christchurch in 1875 and when her mother died in 1881, Andersen took over running the household.

Between 1926 and 1941 she was consistently the president or vice-president of the Club, and led a creative writing group which from 1928 published members' work in a magazine called The Lyceum.

In 1936, Andersen and her husband travelled to Buenos Aires to attend the conference of PEN International.