Sir Ilay Campbell, 1st Baronet, Lord Succoth, FRSE (23 August 1734 – 28 March 1823) was a Scottish advocate, judge and politician.

His mother was Helen Wallace, and his father, Archibald Campbell of Succoth, Principal Clerk of Session to the Scottish Courts.

An advocate from 1757, he was engaged in the Douglas peerage case from 1764 to 1769. in September 1759 Campbell was admitted as an elder of Old Kilpatrick parish.

Lord Cockburn says of him that "he lived like a patriarch in a house overflowing with company, beloved by troops of relations, and courted for his character and hospitality by many friends."

[8] Before her death in 1815, they were the parents of:[9] Lord Succoth died on 28 March 1823 and was succeeded in the baronetcy by his eldest son, Archibald.