Richard Lambart, 2nd Earl of the County of Cavan (1628–1690) was Member of Parliament for Kilbeggan between 1647 and 1649.
He married Rose Ware, daughter of Sir James Ware and Elizabeth Newman and had issue Charles Lambart, 3rd Earl of Cavan.
In 1670 Lambart was declared insane, having suffered from a "deep melancholy" for many years.
This was attributed by his acquaintances to brooding on the wrongs done to him by his brother Oliver, who had persuaded their father to give him much of Richard's inheritance.
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