"Police officer Mahmud Farid died Saturday before dawn from wounds sustained in a terrorist explosion at East Ekar", near Manama, said national security chief General Tareq al-Hassan in a statement published by national news agency BNA.
An investigation has been opened to identify and arrest those behind the attack, he added without giving further details.
Attacks on security forces have been on the rise in Bahrain in recent months, with three police officers, one from the United Arab Emirates, killed in a bomb attack in a Shiite-populated town on March 3.
Security forces boosted by Saudi-led troops ended the protests a month later, but smaller demonstrations frequently take place in Shiite villages, triggering clashes with police.
Bahrain, a strategic archipelago just across the Gulf from Iran, is the home base of the US Fifth Fleet, and Washington is a long-standing ally of the ruling Al-Khalifa dynasty.