The lawmakers, who are members of Sadr's group, say they are rejoining the political process from Sunday. The Shi'ite bloc walked out of parliament seven weeks ago to protest a summit between Iraqi Prime Minister Nouri al-Maliki and U.S. President George W. Bush in Amman, Jordan.
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Sadr's bloc holds 30 seats in parliament and also has six ministers in Mr. Maliki's Cabinet. The Iraqi prime minister has been under pressure from Washington to crack down on Sadr's powerful militia, the Mahdi Army.
U.S.-led forces detained a senior member of Sadr's group last Friday, accusing him of involvement in torture and kidnapping Iraqi civilians.
Some information for this report provided by AP, AFP and Reuters.