Sir David Wedderburn, 3rd Baronet (20 December 1835 – 1882) was a British politician.
The eldest son of Sir John Wedderburn, 2nd Baronet, he was educated at Trinity College, Cambridge, where he graduated as senior optime in 1858. He was called to the Scottish bar in 1861.
He was a justice of the peace for Midlothian and a Captain in the Midlothian Yeomanry.
He was elected as a Liberal Member of Parliament for South Ayrshire in 1868, holding the seat until 1874. He was then elected for Haddington Burghs in 1879, resigning in 1882 by becoming Steward of the Manor of Northstead.
In April 1873, he visited Victor Hugo in Guernsey. He confessed his republican convictions to the great French poet, but added : "If I said that aloud, I would not be reelected".
He lived at Inveresk Lodge, Musselburgh.
He is buried in St. Michaels churchyard in Inveresk.