Frederick Pirani was a New Zealand politician. He was Member of the House of Representatives for Palmerston from 1893 to 1902, first as a Liberal, then as an Independent. He was part of the Liberal Party's "left" (radical) wing.

The 1890 New Zealand general election was one of New Zealand's most significant. It marked the beginning of party politics in New Zealand with the formation of the Liberal Government, which was to enact major welfare, labour and electoral reforms, including giving the vote to women.