The Lokpal bill has passed in the lower house of parliament but the upper house adjourned amid chaos in December without passing the controversial bill.
It would empower an independent ombudsman to prosecute politicians and civil servants suspected of corruption.
Reports say the bill may be taken up again in the current budget session.
Mr Singh told the all-party meeting in the capital, Delhi, that his government was committed to a strong Lokpal bill.
His coalition government has been shaken by a number of corruption scandals.
Opposition parties have moved nearly 100 amendments to the bill, pointing to differences with the government over the composition and powers of the proposed ombudsman.
A recent survey said corruption in India had cost billions of dollars and threatened to derail growth.
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