Sir John Denman Barlow, 2nd Baronet (15 June 1898 – 5 January 1986) was a British Conservative Party politician, and before that was a British Liberal Party member.

Barlow was the son of Sir John Barlow, 1st Baronet, and his wife the Hon. Anna Maria Barlow, daughter of Thomas, 3rd Baron Denman. He was educated at Leighton Park School in Reading along with his brother, Thomas, and numerous other well-known Quaker luminaries of the day.

He initially worked in his father's hugely successful Far Eastern Trading business before standing as a Liberal candidate for Northwich in 1929, moving to the National Liberal Party and being elected for Eddisbury in 1945.

After unsuccessfully contesting Walsall in the 1950 election, Barlow was elected at the 1951 general election as Member of Parliament (MP) for Middleton and Prestwich, succeeding the Conservative Ernest Everard Gates. He held his seat at the 1955 election, the 1959 election and the 1964 election. but at the 1966 general election, he was defeated by Labour's Denis Coe.

Barlow married the Hon. Helen Diana, daughter of George Kemp, 1st Baron Rochdale, in 1928. They had three sons and one daughter. He died in January 1986, aged 87, and was succeeded in the baronetcy by his eldest son John. Lady Barlow died the same year.

Coat of arms of Sir John Barlow, 2nd Baronet

Crest A lion sejant affrontée Or holding erect in the forepaws a cross crosslet fitchée Gules. Escutcheon Per pale Ermine and Gules three chevrons counterchanged over all two lions combatant Or. Motto Qui Non Proficit Deficit[1]