Adelbert Wellington Brownlow-Cust, 3rd Earl Brownlow GCVO VD PC DL JP (19 August 1844 – 17 March 1921), was a British soldier, courtier and Conservative politician.

[1] However, he was forced to resign his seat the following year when he succeeded in the earldom of Brownlow (and viscountcy of Alford) on the death of his older brother, and entered the House of Lords.

He held office under Lord Salisbury as Parliamentary Secretary to the Local Government Board from 1885 to 1886, as Paymaster General from 1887 to 1889 and as Under-Secretary of State for War from 1889 to 1892 and was admitted to the Privy Council in 1887.

Brownlow was a Volunteer Aide-de-Camp to Queen Victoria, Edward VII and George V. He was appointed a Knight Grand Cross of the Royal Victorian Order (GCVO) in the 1921 New Year Honours for his services to the Royal Household.

On his death the Earldom of Brownlow and Viscountcy of Alford became extinct while he was succeeded in his Barony and Baronetcy by his second cousin, Adelbert Cust.