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| Maintained by Puerto Rico DTPW | 
| Length | 24.0 km (14.9 mi) | 
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| Existed | 1953–present | 
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| South end |  PR-31 in Río Blanco | 
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| Major intersections |  PR-969 in Río Blanco | 
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| North end | Río Sabana Recreation Area in Río Blanco | 
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| South end |  PR-9938 in Mameyes II | 
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| Major intersections | 
-  PR-930 in Mameyes II
 
-  PR-9966 in Mameyes II
 
-  PR-988 in Mameyes II
 
-  PR-990 in Mameyes II
 
-  PR-961 in Mameyes II
 
-  PR-955 in Mameyes II
  
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| North end |  PR-3 in Mameyes II | 
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| Country | United States | 
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| Territory | Puerto Rico | 
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| Municipalities | Naguabo, Río Grande | 
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Puerto Rico Highway 191 (PR-191) is a rural road located in eastern Puerto Rico and is the main access to the El Yunque National Forest. The highway currently consists of two discontinuous segments. The northern segment is located in Río Grande, and the southern segment is in Naguabo.