This paper estimates regional income inequality from 1993 to 1998, using a Theil index based upon district-level GDP and population data. Between 1993 and 1997, when Indonesia's annual average growth rate exceeded 7%, regional income inequality rose significantly. A two-stage nested inequality decomposition analysis indicates this was due mainly to an increase in within-province inequality, especially in Riau, Jakarta and West and East Java. In 1997, the within-province component represented about 50% of regional income inequality. The crisis caused per capita GDP growth to revert to its 1995 level, but the impact was spread unevenly across provinces and districts. In 1998 regional income inequality declined to its 1993-94 level. In contrast to 1993-97, three-quarters of the 1998 decline was due to a change in between-province inequality, with the Java-Bali region playing a prominent role. The crisis appears particularly to have afflicted urban Java and urban Sumatra.