In 1977 Sri Lanka was the first of the South Asian countries to decisively move away from the protectionist import-substitution trade policies that for many years had damaged their economic efficiency and hobbled their economic growth. Albeit with back-tracking episodes, Sri Lanka’s liberalising trade policy reforms-especially reductions in the average level of import tariffs- were broadened and extended during the following 23 years. Together with other economic reforms this supported the rapid growth of manufactured exports, and made it possible for the economy to grow at moderate to high rates despite continuing political turmoil and civil war. Protectionist pressures began to build in 2001, however, and starting in November 2004, the relatively open trade policies of the past were explicitly and systematically reversed. By 2009, mainly through the proliferation of a variety of para-tariffs, Sri Lanka’s tariff policies were just as protective as they had been more than 20 years earlier. The principal purpose of this paper is to describe, quantify and analyse these developments. The paper concludes by pointing out the serious potential damage of the protectionist trade policies to Sri Lanka’s future economic growth, and the resulting subversion of its preferential trade agreements, especially the agreements with India (ILFTA), Pakistan (PSFTA) and with the South Asian countries as a group (SAFTA). It also comments on the resulting breaches of Sri Lanka’s WTO commitments (especially in agriculture), and the more general issues that the unfettered use of para-tariffs by Sri Lanka and Bangladesh raise for the world multilateral trading system.