diff --git a/flang/include/flang/Optimizer/HLFIR/CMakeLists.txt b/flang/include/flang/Optimizer/HLFIR/CMakeLists.txt
--- a/flang/include/flang/Optimizer/HLFIR/CMakeLists.txt
+++ b/flang/include/flang/Optimizer/HLFIR/CMakeLists.txt
@@ -5,6 +5,8 @@
 mlir_tablegen(HLFIRDialect.cpp.inc -gen-dialect-defs -dialect=hlfir)
 mlir_tablegen(HLFIRAttributes.h.inc -gen-attrdef-decls -attrdefs-dialect=hlfir)
 mlir_tablegen(HLFIRAttributes.cpp.inc -gen-attrdef-defs -attrdefs-dialect=hlfir)
+mlir_tablegen(HLFIREnums.h.inc -gen-enum-decls)
+mlir_tablegen(HLFIREnums.cpp.inc -gen-enum-defs)
 
 set(LLVM_TARGET_DEFINITIONS HLFIROps.td)
 mlir_tablegen(HLFIROps.h.inc -gen-op-decls)
diff --git a/flang/include/flang/Optimizer/HLFIR/HLFIRDialect.h b/flang/include/flang/Optimizer/HLFIR/HLFIRDialect.h
--- a/flang/include/flang/Optimizer/HLFIR/HLFIRDialect.h
+++ b/flang/include/flang/Optimizer/HLFIR/HLFIRDialect.h
@@ -26,6 +26,8 @@
 
 #include "flang/Optimizer/HLFIR/HLFIRDialect.h.inc"
 
+#include "flang/Optimizer/HLFIR/HLFIREnums.h.inc"
+
 #define GET_TYPEDEF_CLASSES
 #include "flang/Optimizer/HLFIR/HLFIRTypes.h.inc"
 
diff --git a/flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td b/flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
--- a/flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
+++ b/flang/include/flang/Optimizer/HLFIR/HLFIROpBase.td
@@ -15,6 +15,7 @@
 #define FORTRAN_DIALECT_HLFIR_OP_BASE
 
 include "mlir/IR/AttrTypeBase.td"
+include "mlir/IR/EnumAttr.td"
 include "mlir/IR/OpBase.td"
 include "flang/Optimizer/Dialect/FIRTypes.td"
 
@@ -108,4 +109,12 @@
 def AnyScalarCharacterExpr : Type<IsFortranScalarCharacterExprPred,
     "any character scalar expression type">;
 
+def hlfir_CharExtremumPredicateAttr : I32EnumAttr<
+    "CharExtremumPredicate", "",
+    [
+      I32EnumAttrCase<"min", 0>,
+      I32EnumAttrCase<"max", 1>
+    ]> {
+  let cppNamespace = "hlfir";
+}
 #endif // FORTRAN_DIALECT_HLFIR_OP_BASE
diff --git a/flang/include/flang/Optimizer/HLFIR/HLFIROps.td b/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
--- a/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
+++ b/flang/include/flang/Optimizer/HLFIR/HLFIROps.td
@@ -236,6 +236,27 @@
   let hasVerifier = 1;
 }
 
+def hlfir_CharExtremumOp : hlfir_Op<"char_extremum", []> {
+  let summary = "Find max/min from given character strings";
+  let description = [{
+    Find the minimum or maximum of two or more character strings of a same character kind and return the string with the minimum or maximum number of characters. Example:
+
+    %0 = hlfir.char_extremum(min, %arg0, %arg1) : (!fir.ref<!fir.char<1,10>>, !fir.ref<!fir.char<1,9>>) -> index
+  }];
+
+  let arguments = (ins hlfir_CharExtremumPredicateAttr:$predicate,
+                  Variadic<AnyScalarCharacterEntity>:$strings
+  );
+
+  let results = (outs AnyScalarCharacterExpr);
+
+  let assemblyFormat = [{
+    $predicate `,` $strings attr-dict `:` functional-type(operands, results)
+  }];
+
+  let hasVerifier = 1;
+}
+
 def hlfir_SetLengthOp : hlfir_Op<"set_length", []> {
   let summary = "change the length of a character entity";
   let description = [{
diff --git a/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp b/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
--- a/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
+++ b/flang/lib/Optimizer/HLFIR/IR/HLFIROps.cpp
@@ -402,6 +402,22 @@
   build(builder, result, resultType, strings, len);
 }
 
+//===----------------------------------------------------------------------===//
+// CharExtremumOp
+//===----------------------------------------------------------------------===//
+
+mlir::LogicalResult hlfir::CharExtremumOp::verify() {
+  // there could probably be some refactoring between this verify() and ConcatOp's verify since they're the same...
+  if (getStrings().size() < 2)
+    return emitOpError("must be provided at least two string operands");
+  unsigned kind = getCharacterKind(getResult().getType());
+  for (auto string : getStrings())
+    if (kind != getCharacterKind(string.getType()))
+      return emitOpError("strings must have the same KIND as the result type");
+  return mlir::success();
+}
+
+
 //===----------------------------------------------------------------------===//
 // SetLengthOp
 //===----------------------------------------------------------------------===//
@@ -527,4 +543,5 @@
 }
 
 #define GET_OP_CLASSES
+#include "flang/Optimizer/HLFIR/HLFIREnums.cpp.inc"
 #include "flang/Optimizer/HLFIR/HLFIROps.cpp.inc"