New Zealand won the last completed Test series between England and New Zealand that I found: England beat New Zealand 2-1 in New Zealand in December 2024, after England sealed the series with a dominant win in the second Test. New Zealand did win the final Test of that tour by 423 runs, but the overall series still went to England.

Quick context

  • Series result: England 2-1 New Zealand.
  • Last Test result: New Zealand won by 423 runs in Hamilton.
  • So the answer to “who won the last test series” is England.

TL;DR

England won the most recent Test series between the two sides, even though New Zealand took the final match of that series.