<page_title> List of Prime Ministers of New Zealand </page_title> <section_title> List </section_title> <table> <cell> 19 <col_header> No. </col_header> <col_header> Colonial Secretaries (1856–1869) </col_header> <col_header> 1 </col_header> <col_header> 14 days </col_header> <col_header> 2 </col_header> <col_header> 14 days </col_header> <col_header> 3 </col_header> <col_header> 5 years and 41 days </col_header> <col_header> (2) </col_header> <col_header> 1 year and 26 days </col_header> <col_header> 4 </col_header> <col_header> 1 year and 86 days </col_header> <col_header> 5 </col_header> <col_header> 1 year and 26 days </col_header> <col_header> 6 </col_header> <col_header> 327 days </col_header> <col_header> (3) </col_header> <col_header> 6 years and 257 days </col_header> <col_header> Premiers (1869–1907) </col_header> <col_header> (2) </col_header> <col_header> 3 years and 75 days </col_header> <col_header> (3) </col_header> <col_header> 32 days </col_header> <col_header> 7 </col_header> <col_header> 144 days </col_header> <col_header> (2) </col_header> <col_header> 37 days </col_header> <col_header> 8 </col_header> <col_header> 2 years and 90 days </col_header> <col_header> 9 </col_header> <col_header> 225 days </col_header> <col_header> (8) </col_header> <col_header> 200 days </col_header> <col_header> 10 </col_header> <col_header> 1 year and 43 days </col_header> <col_header> 11 </col_header> <col_header> 1 year and 361 days </col_header> <col_header> 12 </col_header> <col_header> 2 years and 196 days </col_header> <col_header> (5) </col_header> <col_header> 1 year and 158 days </col_header> <col_header> (10) </col_header> <col_header> 327 days </col_header> <col_header> 13 </col_header> <col_header> 13 days </col_header> <col_header> (10) </col_header> <col_header> 7 days </col_header> <col_header> (13) </col_header> <col_header> 3 years and 36 days </col_header> <col_header> (10) </col_header> <col_header> 3 years and 109 days </col_header> <col_header> 14 </col_header> <col_header> 2 years and 94 days </col_header> <col_header> 15 </col_header> <col_header> 13 years and 41 days </col_header> <col_header> 16 </col_header> <col_header> 47 days </col_header> <col_header> Prime Ministers (1907–present) </col_header> <col_header> 17 </col_header> <col_header> 5 years and 220 days </col_header> <col_header> 18 </col_header> <col_header> 105 days </col_header> <row_header>  </row_header> </cell> <cell> The Right Honourable William Massey MP for Franklin (1856–1925) <col_header> Name (Birth–Death) Constituency </col_header> <col_header> Colonial Secretaries (1856–1869) </col_header> <col_header> 14 days </col_header> <col_header> 14 days </col_header> <col_header> 5 years and 41 days </col_header> <col_header> 1 year and 26 days </col_header> <col_header> 1 year and 86 days </col_header> <col_header> 1 year and 26 days </col_header> <col_header> 327 days </col_header> <col_header> 6 years and 257 days </col_header> <col_header> Premiers (1869–1907) </col_header> <col_header> 3 years and 75 days </col_header> <col_header> 32 days </col_header> <col_header> 144 days </col_header> <col_header> 37 days </col_header> <col_header> 2 years and 90 days </col_header> <col_header> 225 days </col_header> <col_header> 200 days </col_header> <col_header> 1 year and 43 days </col_header> <col_header> 1 year and 361 days </col_header> <col_header> 2 years and 196 days </col_header> <col_header> 1 year and 158 days </col_header> <col_header> 327 days </col_header> <col_header> 13 days </col_header> <col_header> 7 days </col_header> <col_header> 3 years and 36 days </col_header> <col_header> 3 years and 109 days </col_header> <col_header> 2 years and 94 days </col_header> <col_header> 13 years and 41 days </col_header> <col_header> 47 days </col_header> <col_header> Prime Ministers (1907–present) </col_header> <col_header> 5 years and 220 days </col_header> <col_header> 105 days </col_header> <row_header>  </row_header> <row_header> 19 </row_header> </cell> <cell> 10 July 1912 <col_header> Term of office </col_header> <col_header> Colonial Secretaries (1856–1869) </col_header> <col_header> Premiers (1869–1907) </col_header> <col_header> Prime Ministers (1907–present) </col_header> <row_header>  </row_header> <row_header> 19 </row_header> </cell> <cell> 10 May 1925† <col_header> Term of office </col_header> <col_header> Colonial Secretaries (1856–1869) </col_header> <col_header> Premiers (1869–1907) </col_header> <col_header> Prime Ministers (1907–present) </col_header> <row_header>  </row_header> <row_header> 19 </row_header> </cell> </table>
William Ferguson Massey PC (1856 – 1925) served as the 19th Prime Minister of New Zealand from 1912 to May 1925.