The Raglan by-election of 1927 was a by-election held in the Raglan electorate during the 22nd New Zealand Parliament, on 29 September 1927. It was caused by the death of incumbent MP Richard Bollard of the Reform Party. Despite being a local contest it quickly became a national contest in miniature due to growing discontent with the Reform Government.

The 22nd New Zealand Parliament was a term of the New Zealand Parliament. Its composition was determined by the 1925 election, and it sat until the 1928 election.