Sir Robert Jermyn was an English politician.

He was the eldest surviving son of Sir Ambrose Jermyn and was admitted to the Middle Temple in 1560–61. In 1577 he succeeded to his father's Suffolk estates and seat at Rushbrooke, Suffolk's largest and finest moated Tudor mansion. Around this time he was brought onto the commission of the peace. He was knighted by Queen Elizabeth I in 1578 and appointed High Sheriff of Suffolk

High Sheriff of Suffolk

This is a list of High Sheriffs of Suffolk. The High Sheriff is the oldest secular office under the Crown and is appointed annually by the Crown. He was originally the principal law enforcement officer in the county and presided at the Assizes and other important county meetings...

 for 1579.

Hoever his extreme protestant views saw him removed from the judicial bench from 1583 until 1593. During this enforced absence he served as the junior Knight of the Shire (MP) for Suffolk

Suffolk (UK Parliament constituency)

Suffolk was a county constituency of the Parliament of the United Kingdom, which returned two Members of Parliament to the House of Commons from 1290 until 1832, when it was split into two divisions.-Boundaries and franchise:...

 in the parliament of 1584 and as the senior knight in 1586. He was also a deputy lieutenant and Custos Rotulorum of Suffolk

Custos Rotulorum of Suffolk

This is a list of people who have served as Custos Rotulorum of Suffolk.* Sir Humphrey Wingfield bef. 1544–1545* John Gosnold bef. 1547–1554* Sir William Cordell bef. 1558 – bef. 1562* Sir Clement Heigham bef. 1562–1571...

 bef. 1594–1614.

He then served as Member of Parliament

Member of Parliament

A Member of Parliament is a representative of the voters to a :parliament. In many countries with bicameral parliaments, the term applies specifically to members of the lower house, as upper houses often have a different title, such as senate, and thus also have different titles for its members,...

 (MP) for East Looe

East Looe (UK Parliament constituency)

East Looe was a parliamentary borough represented in the House of Commons of England from 1571 to 1707, in the House of Commons of Great Britain from 1797 to 1800, and finally in the House of Commons of the United Kingdom from 1801 until its abolition in 1832. It elected two Members of Parliament ...

in 1588-1589.

He died in 1614 and was buried at Rushbrooke. He had married Judith, the daughter of Sir George Blagg of Little Horringer, Suffolk had at least two sons, including Sir Thomas Jermyn, and five daughters.