Gregor McGregor (18 October 1848 – 13 August 1914) was an Australian politician who served as a Senator for South Australia from 1901 until his death in 1914, representing the Labor Party.

He initially worked as an agricultural labourer, and for a period he was employed by Richard Baker, one of his future Senate colleagues.

[3] In the Legislative Council, McGregor advocated for new workers' rights, but was also known for his opposition to South Australian involvement in the Boer War and as "a fervent protectionist who espoused the sanctity of White Australia".

[1] He was the final senator to be elected, recording only 644 more votes than his nearest opponent, Andrew Kirkpatrick.

Chris Watson, Labor's first leader, described McGregor as "a powerful force in our party because of his political sagacity and perfect loyalty".

He experienced a gradual deterioration in his vision, which he attributed to an accident he had shortly after arriving in Australia.

He compensated for his blindness with a memory described as "astounding", able to recite lengthy passages perfectly after hearing them read out loud, usually by his mother-in law.