This paper analyses total factor productivity growth in the unorganized manufacturing sector in India using several rounds of the large scale National Sample Survey state-level data for 15 major Indian states for the period 1978-79 to 2000-01. Data Envelopment Analysis is used to compute Malmquist total factor productivity index and its components. The impact of economic reforms on efficiency is examined. Evidence suggests that total factor productivity registered a positive growth during the period in the country as a whole. Most states in the country witnessed higher total factor productivity growth in the post 1990s reform period than in the pre-reform years. Decomposition of the Malmquist productivity index shows that improvement in technical efficiency rather than technical progress had contributed to the observed acceleration in the growth rate. Technological regress was observed which has continued at a decelerated rate in the reforms period. Econometric analysis of the determinants of total factor productivity growth indicates tendency towards convergence in the productivity growth rate across the Indian states.