Common wild rice (Oryza rufipogon Griff.), distinguished by exceptional genetic diversity and outstanding environmental plasticity, constitutes an invaluable gene reservoir for the genetic improvement of cultivated rice. Rice blast (Magnaporthe oryzae) is listed in the List of Class I Crop Diseases and Pests issued by the Ministry of Agriculture and Rural Affairs of the People's Republic of China. Harnessing elite resistance sources to breed broad-spectrum resistant cultivars represents the most cost-effective and sustainable strategy for managing this pathogen. Here,1018 O. rufipogon Griff.accessions collected from Guangdong, Hainan and Guangxi were systematically screened against a panel of 42 predominant M. oryzae physiological races originating from Sichuan, Chongqing, Guizhou, Jiangxi, Yunnan, Hubei and Jiangsu. When challenged with the Southwest composite inoculum (races pooled from Sichuan, Guizhou and Chongqing), 88 accessions exhibited resistance (R), 34 moderate resistance (MR), 124 moderate susceptibility (MS) and 772 susceptibility (S). Subsequent race-specific assays on the 122 resistant accessions revealed that 59 (48.4 %) conferred resistance to Hubei isolate B27, 73 (59.8 %) to the Jiangxi race mixture, 107 (87.7 %) to Yunnan isolate Q12 and 102 (83.6 %) to Jiangsu isolate C62. Iterative screening against all 42 races ultimately identified 59 accessions displaying broad-spectrum resistance, comprising 45 from Guangdong, 5 from Guangxi and 9 from Hainan. Notably, the proportion of broad-spectrum resistant accessions was significantly higher in Hainan (22.0 %) than in Guangdong (5.1 %) or Guangxi (5.4 %). These precisely characterized, broad-spectrum resistant wild rice resources provide an indispensable genetic foundation for future blast-resistance research and breeding.