Technical Abstract: Wheat stem rust caused by Puccinia graminis f. sp. tritici, can cause significant crop loss. To avoid these losses breeders have deployed resistance genes both individually and in combined pyramids with the hope to extend the resistance durability. A new race of stem rust, TTKSK (Ug99), was discovered in Uganda in 1999. This race is virulent on most of the resistance genes currently deployed and is rapidly spreading to other regions of the world. It is therefore important to identify, map, and deploy resistance genes that are still effective against TTKSK. One of these resistance genes, Sr13, was previously assigned to the long arm of chromosome 6A but its precise map location is not known. We present here genetic maps of Sr13 developed from three tetraploid wheat (T. turgidum ssp. durum) mapping populations. The first population includes 93 SSD lines from the cross between durum lines Kofa and UC1113, and the resistance gene was contributed by Kofa and was mapped on the long arm of chromosome 6A between markers Xwmc580 and Xdupw167. The second and third populations include crosses between Mindum and Medora (97 F2 lines) or Sceptre (80 F2 lines). In these last two populations the resistance was contributed by Medora and Sceptre, and was mapped in a similar location as in the Kofa x UC1113. These results suggest that these durum lines carry the same resistance gene. Based on its chromosome location this gene is most likely Sr13. These maps will be the foundation for developing diagnostic markers, for high-density mapping, and for the eventual position cloning of Sr13.