Wamea-Picton was a parliamentary electorate in the Marlborough and Nelson Regions of New Zealand, from 1887 to 1893.
In the 1887 electoral redistribution, although the Representation Commission was required through the Representation Act 1887 to maintain existing electorates "as far as possible", rapid population growth in the North Island required the transfer of three seats from the South Island to the north. Ten new electorates were created, including Wamea-Picton, and one former electorate was recreated.  The electorate's original area covered the surroundings of the city of Nelson including Richmond, Havelock, and Picton. The southern boundary was the Wairau River. 
In December 1887, the House of Representatives voted to reduce its membership from general electorates from 91 to 70. The 1890 electoral redistribution used the same 1886 census data used for the 1887 electoral redistribution. In addition, three-member electorates were introduced in the four main centres. This resulted in a major restructuring of electorates, and the area covered by the Wamea-Picton electorate was significantly altered. The southern boundary shifted north, i.e. away from the Wairau River. Richmond was lost to the Nelson electorate, and the area covered extended to the north-west to just short of Motueka, absorbing much of the area previously covered by the Motueka electorate. 
In the 1893 electoral redistribution, population shift to the North Island required the transfer of one seat from the South Island to the north. The resulting ripple effect saw every electorate established in 1890 have its boundaries altered, and many electorates, including Wamea-Picton, were abolished.  Most of its area went to the Waimea Sounds electorate. The town of Picton went to the Wairau electorate, but the town of Motueka was gained from the Buller electorate. 
The electorate was represented by two Members of Parliament, Arthur Seymour from 1887 to 1890 and Charles H. Mills from 1890 to 1893. 
The 1887 general election was contested by Seymour, Joseph Harkness and Mills, who received 446, 444 and 415 votes, respectively. 
The 1890 general election in the Waimea-Picton electorate was contested by Mills, Richmond Hursthouse and William Henry Phillips, who received 936, 728 and 80 votes, respectively. Mills was thus elected. 
|1887 election||Arthur Seymour|
|1890 election||Charles H. Mills|
|Liberal||Charles H. Mills||940||54.11|
|Independent||William Henry Phillips||67||3.85|
The New Zealand general election of 1887 was held on 26 September to elect 95 MPs to the tenth session of the New Zealand Parliament. The Māori vote was held on 7 September. 175,410 votes were cast. In 5 seats there was only one candidate.
Arthur Penrose Seymour was a 19th-century New Zealand politician from Picton. He was the 4th Superintendent of the Marlborough Province and was a member of the provincial government for all 16 years of its existence. With his strong advocacy for Picton, he successfully had the Seat of Government moved to Picton. When the Blenheim party secured a majority in the Provincial Council by 1865, Seymour negotiated the removal of the Seat of Government back to Blenheim.
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The 10th New Zealand Parliament was a term of the Parliament of New Zealand. Elections for this term were held in 4 Māori electorates and 91 European electorates on 7 and 26 September 1887, respectively. A total of 95 MPs were elected. Parliament was prorogued in October 1890. During the term of this Parliament, two Ministries were in power.