The Holland with Boston by-election, 1929 was a by-election held on 21 March 1929 for the British House of Commons constituency of Holland with Boston in Lincolnshire.
The by-election was caused by the death of the town's Unionist Party Member of Parliament (MP) Arthur Dean, who had held the seat at the 1924 general election. At that election, Labour came second and the Liberals third. Labour had won the seat in 1918, but it had been gained by the Unionists in a by-election just before the 1924 general election.
The new Unionist candidate chosen to defend the seat was Frederick J. Van den Berg. He was born and raised in Johannesburg, before moving to London to practise as a Barrister in 1916. He was standing as a candidate for the first time. The Labour candidate was George Blanco White, a lawyer who had stood here last time. The Liberals chose a new candidate in James Blindell a Managing Director of a Boot Manufacturing business. The election was marked by the presence of an Agricultural Party candidate, F.W. Dennis.
On 1 March, nationally, Liberal leader, David Lloyd George launched the Liberal programme for the upcoming general election, titled We Can Conquer Unemployment. On the eve of poll, the voters of Eddisbury elected a Liberal in place of a Unionist.
The result was a victory for the Liberal Party candidate James Blindell, who overturned a Unionist majority of 4,770 to win by a majority of 3,706 votes.
A General election followed in a matter of months. Blindell held the seat for the Liberals, with Van den Berg again standing for the Unionists, finishing second. White did not stand again and the new Labour candidate dropped to third place. The Agricultural Party did not contest the seat. This was the last by-election gain for the Liberal Party until the Torrington by-election, 1958.