Walter Woon Cheong Ming is a Singaporean lawyer who served as the fifth attorney-general of Singapore between 2008 and 2010. He is currently an Emeritus Professor at the National University of Singapore Faculty of Law, Lee Kong Chian Visiting professor at the Singapore Management University Yong Pung How School of Law, and the dean of the RHT Legal Training Institute.

The attorney-general of Singapore is the public prosecutor of the Republic of Singapore and legal adviser to the Government of Singapore. The attorney-general is the head of the Attorney-General's Chambers (AGC), whose staff carries out the functions of the attorney-general. The attorney-general is appointed by the president, on the advice of the prime minister, under Article 35 of the Constitution of Singapore. Unlike some countries that follow the Westminster parliamentary model, the attorney-general is not a Member of Parliament.