James Walter Grimston, 2nd Earl of Verulam (20 February 1809 – 27 July 1895), known as Viscount Grimston from 1815 to 1845, was a British peer and Conservative politician. He was the eldest son of James Walter Grimston, 1st Earl of Verulam, and Lady Charlotte Jenkinson. He succeeded his father as 2nd Earl of Verulam in November 1845.
In 1860, The Times noted that Grimston was one of only three to hold peerages in all three Kingdoms of England, Scotland and Ireland.
Lord Verulam married Elizabeth Joanna Weyland, daughter of Richard Weyland, in 1844. They had six children:
Lord Verulam died in July 1895, aged 86, and was succeeded in his titles by his eldest son James.
Verulam was elected to the House of Commons for St Albans in 1830, a seat he held until 1831, and then represented Newport, Cornwall from 1831 to 1832 and Hertfordshire from 1832 to 1845. The latter year Verulam succeeded his father in the earldom and entered the House of Lords. He later served in the first two administrations of the Earl of Derby as a Lord-in-Waiting (government whip in the House of Lords) in 1852 and from 1858 to 1859. Between 1845 and 1892 he also held the honorary post of Lord Lieutenant of Hertfordshire, in succession to his father.
Grimston owned property in Jamaica, and following the abolition of the slave trade, between 1836 and 1837 he was associated with claims of £7,359 18s 4d in compensation for the loss of 376 slaves.