Calum Murray and Steven McLean will take charge of the two Sky Sports live games in the Scottish Premiership this weekend, with St Mirren at home to Aberdeen on Saturday and Celtic up against St Johnstone on Sunday.
Barry Cook is the referee as Championship leaders Dundee go to Queen of the South while John McKendrick is the man in the middle as Ayr United welcome League 1 frontrunners Rangers to Somerset Park.
Stephen Finnie will handle the League 2 meeting of leaders Peterhead and third-placed Clyde.
Scottish Premiership - Saturday
Dundee United v Kilmarnock - John Beaton
Hibernian v Ross County - Bobby Madden
Inverness CT v Heart of Midlothian Craig Thomson
Motherwell v Partick Thistle - Euan Norris
St Mirren v Aberdeen - Calum Murray
(live on Sky Sports, 12.45pm)
Scottish Premiership - Sunday
Celtic v St Johnstone - Steven McLean
(live on Sky Sports, 12.45pm)
Scottish Championship - Saturday
Alloa Athletic v Livingston - Iain Brines
Dumbarton v Falkirk - Greg Aitken
Morton v Cowdenbeath - Brian Colvin
Queen of the South v Dundee - Barry Cook
Raith Rovers v Hamilton Academical - Willie Collum
Scottish League 1 - Saturday
Airdrieonians v Brechin City - Mat Northcroft
Ayr United v Rangers - John McKendrick
Forfar Athletic v Dunfermline Athletic - Euan Anderson
Stenhousemuir v East Fife - Nick Walsh
Stranraer v Arbroath - David Somers
Scottish League 2 - Saturday
Annan Athletic v East Stirlingshire - Andrew Dallas
Berwick Rangers v Elgin City - Gavin Duncan (4pm kick-off)
Montrose v Queen's Park - Des Roache
Peterhead v Clyde - Stephen Finnie
Stirling Albion v Albion Rovers - Ian MacNabb
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