Hertfordshire was a constituency of the European Parliament located in the United Kingdom, electing one Member of the European Parliament by the first-past-the-post electoral system.

[1] After the 1984 boundary changes based on the new UK parliamentary constituencies created in 1983, it consisted of the constituencies of Broxbourne, Hertford and Stortford, Hertsmere, St. Albans, South West Hertfordshire, Watford and Welwyn Hatfield.

[3] Broxbourne as well as Hertford and Stortford were now part of Essex West and Hertfordshire East.

The entire area became part of the East of England constituency in 1999.

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