The Right Hon. Alexander Maconochie, Lord Meadowbank of Garvock and Pitliver FRSE FSA(Scot) (1777–1861), was a Scottish advocate, judge, landowner and politician. After 1854 he took the surname Maconochie-Welwood.
Born on 2 March 1777 in West Lothian, the son of Allan Maconochie, Lord Meadowbank and Elizabeth Welwood of Garvock, he was educated at the High School, Edinburgh, and probably at Edinburgh University, and admitted as an advocate in 1799. He was admitted to the Highland Society in 1800.
In 1817 he was elected a Fellow of the Royal Society of Edinburgh. His proposers were Sir William Arbuthnot, 1st Baronet, Thomas Allan, Sir David Brewster and Sir Henry Jardine. He served as a Councillor of the Society during 1822-5 (Literary section) and 1835-7.
He served as Solicitor General for Scotland from 1813, and as Lord Advocate from 1816 to 1819.
In keeping with his appointment as Lord Advocate, he was Member of Parliament for Yarmouth, Isle of Wight, England, from 1817–1818, for the Kilrenny district of Anstruther Burghs from 1818 to 1819. He made his Parliamentary debut during a period of considerable unrest in both Scotland and England in 1817, choosing to mark it by announcing the existence of a seditious conspiracy of weavers in the suburbs of Glasgow. The ensuing prosecutions were spectacularly unsuccessful, however, and caused considerable embarrassment, both to the government and to Maconochie himself, who, as Lord Advocate, was directly responsible.
In the 1830s, his address is listed as 13 Royal Circus, in the north section of Edinburgh's Second New Town.
In part because of his rather indifferent record, especially after further embarrassment in the Court of Session in 1819, he was appointed a lord of session and justiciary as Lord Meadowbank 1819, and resigned in 1843. With the same title as his father, he was subject of one of Scots law's better puns. When he quizzed one advocate as to the difference between 'likewise and also', he received the reply that just as his father had been Lord Meadowbank, so was he, 'also but not likewise'.
He assumed the additional surname of Welwood on succeeding to his cousin's estates in 1854.
Maconochie-Welwood died on 30 November 1861 at Meadowbank House (now named Kirknewton House), Kirknewton, West Lothian, and was interred at a private burial ground at Meadowbank House.
In 1805 he married Anne Blair the daughter of Robert Blair, Lord Avontoun.
There children included Allan Alexander Maconochie FRSE (1806-1885).