Simon II de Senlis, 4th Earl of the Honour of Huntingdon and Northampton (c. 1098–1153) was an Anglo-Norman nobleman. He was the son of Simon I de Senlis, Earl of Huntingdon-Northampton and Maud, Countess of Huntingdon. He married Isabel, daughter of Robert de Beaumont, 2nd Earl of Leicester.
He was prominent in The Anarchy, fighting for Stephen of England in 1141 at the Battle of Lincoln. He continued to support Stephen's side; R. H. C. Davis calls him 'staunch' and 'consistently loyal' and surmises that Simon calculated that if the Empress Matilda won, his earldom of Northampton would be taken over by David of Scotland.
Simon was rewarded by becoming Earl of Huntingdon. He died in 1153 just before Henry II of England took over, whereupon the King restored the Earldom of Huntingdon-Northampton to his ally Malcolm IV of Scotland 
Henry of Scotland
| Earl of Huntingdon
Malcolm IV of Scotland
Title last held bySimon I de Senlis
| Earl of Northampton
Title next held byWilliam de Bohun
- Stringer, Keith, "Senlis, Simon (II) de, earl of Northampton and earl of Huntingdon (d. 1153)", Oxford Dictionary of National Biography, Oxford University Press, 2004 accessed 20 May 2007
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