In this paper, the problem of laminar natural convection over an isothermal horizontal cylinder with multiple, low-conductivity, longitudinal baffles is considered. The cylinder is assumed to be suspended in air. Results are obtained numerically over the range 10(3) less than or equal to Ra less than or equal to 10(6), gamma = 0.25 and 0.5 and N = 0, 1, 3, 5, 11, where gamma is the dimensionless baffle length and N is the number of baffles. The results show that baffles are extremely effective in reducing the overall heat loss from the cylinder. Based on the cases considered in this study, energy savings as large as 68.4% (as compared to the case of a cylinder with no-baffles) can be realized if baffles are used. The overall baffle effectiveness increases as the number and baffle length increases.