diff --git a/entrypoint_cpp.sh b/entrypoint_cpp.sh
index faa740f..3af337d 100644
--- a/entrypoint_cpp.sh
+++ b/entrypoint_cpp.sh
@@ -46,14 +46,26 @@ if [ -z "$INPUT_EXCLUDE_DIR" ]; then
     files_to_check=$(python3 /src/get_files_to_check.py -dir="$GITHUB_WORKSPACE" -preselected="$preselected_files" -lang="c++")
     debug_print "Running: files_to_check=python3 /src/get_files_to_check.py -dir=\"$GITHUB_WORKSPACE\" -preselected=\"$preselected_files\" -lang=\"c++\")"
 else
-    files_to_check=$(python3 /src/get_files_to_check.py -exclude="$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR" -dir="$GITHUB_WORKSPACE" -preselected="$preselected_files" -lang="c++")
-    debug_print "Running: files_to_check=python3 /src/get_files_to_check.py -exclude=\"$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR\" -dir=\"$GITHUB_WORKSPACE\" -preselected=\"$preselected_files\" -lang=\"c++\")"
+    files_to_check=$(python3 /src/get_files_to_check.py -exclude="$INPUT_EXCLUDE_DIR" -dir="$GITHUB_WORKSPACE" -preselected="$preselected_files" -lang="c++")
+    debug_print "Running: files_to_check=python3 /src/get_files_to_check.py -exclude=\"$INPUT_EXCLUDE_DIR\" -dir=\"$GITHUB_WORKSPACE\" -preselected=\"$preselected_files\" -lang=\"c++\")"
 fi
 
 debug_print "Files to check = $files_to_check"
 debug_print "CPPCHECK_ARGS = $CPPCHECK_ARGS"
 debug_print "CLANG_TIDY_ARGS = $CLANG_TIDY_ARGS"
 
+cppcheck_exclude_args=""
+if [ -n "$INPUT_EXCLUDE_DIR" ]; then
+    read -r -a exclude_dirs <<< "$INPUT_EXCLUDE_DIR"
+    for exclude_dir in "${exclude_dirs[@]}"; do
+        exclude_path="$exclude_dir"
+        if [[ "$exclude_path" != /* ]]; then
+            exclude_path="$GITHUB_WORKSPACE/$exclude_path"
+        fi
+        cppcheck_exclude_args="$cppcheck_exclude_args -i$exclude_path"
+    done
+fi
+
 num_proc=$(nproc)
 
 if [ -z "$files_to_check" ]; then
@@ -71,16 +83,12 @@ else
         fi
 
         for file in $files_to_check; do
-            exclude_arg=""
-            if [ -n "$INPUT_EXCLUDE_DIR" ]; then
-                exclude_arg="-i$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR"
-            fi
-
             # Replace '/' with '_'
             file_name=$(echo "$file" | tr '/' '_')
 
-            debug_print "Running cppcheck --project=$compile_commands_path $CPPCHECK_ARGS --file-filter=$file --output-file=cppcheck_$file_name.txt $exclude_arg"
-            eval cppcheck --project="$compile_commands_path" "$CPPCHECK_ARGS" --file-filter="$file" --output-file="cppcheck_$file_name.txt" "$exclude_arg" || true
+            debug_print "Running cppcheck --project=$compile_commands_path $CPPCHECK_ARGS --file-filter=$file --output-file=cppcheck_$file_name.txt $cppcheck_exclude_args"
+            cppcheck_cmd="cppcheck --project=\"$compile_commands_path\" $CPPCHECK_ARGS --file-filter=\"$file\" --output-file=\"cppcheck_$file_name.txt\"$cppcheck_exclude_args"
+            eval "$cppcheck_cmd" || true
         done
 
         cat cppcheck_*.txt > cppcheck.txt
diff --git a/entrypoint_python.sh b/entrypoint_python.sh
index 292c9af..8062703 100644
--- a/entrypoint_python.sh
+++ b/entrypoint_python.sh
@@ -18,8 +18,8 @@ if [ -z "$INPUT_EXCLUDE_DIR" ]; then
     debug_print "Running: files_to_check=\$(python3 /src/get_files_to_check.py -dir=\"$GITHUB_WORKSPACE\" -include=\"$INPUT_PYTHON_DIRS\" -preselected=\"$preselected_files\" -lang=\"python\")"
     files_to_check=$(python3 /src/get_files_to_check.py -dir="$GITHUB_WORKSPACE" -include="$INPUT_PYTHON_DIRS" -preselected="$preselected_files" -lang="python")
 else
-    debug_print "Running: files_to_check=\$(python3 /src/get_files_to_check.py -exclude=\"$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR\" -dir=\"$GITHUB_WORKSPACE\" -include=\"$INPUT_PYTHON_DIRS\" -preselected=\"$preselected_files\" -lang=\"python\")"
-    files_to_check=$(python3 /src/get_files_to_check.py -exclude="$GITHUB_WORKSPACE/$INPUT_EXCLUDE_DIR" -dir="$GITHUB_WORKSPACE" -include="$INPUT_PYTHON_DIRS" -preselected="$preselected_files" -lang="python")
+    debug_print "Running: files_to_check=\$(python3 /src/get_files_to_check.py -exclude=\"$INPUT_EXCLUDE_DIR\" -dir=\"$GITHUB_WORKSPACE\" -include=\"$INPUT_PYTHON_DIRS\" -preselected=\"$preselected_files\" -lang=\"python\")"
+    files_to_check=$(python3 /src/get_files_to_check.py -exclude="$INPUT_EXCLUDE_DIR" -dir="$GITHUB_WORKSPACE" -include="$INPUT_PYTHON_DIRS" -preselected="$preselected_files" -lang="python")
 fi
 
 debug_print "Files to check = $files_to_check"
diff --git a/src/sa_utils.py b/src/sa_utils.py
index 25ba8cb..abed0fa 100644
--- a/src/sa_utils.py
+++ b/src/sa_utils.py
@@ -208,6 +208,12 @@ def check_for_char_limit(incoming_line):
     return (CURRENT_COMMENT_LENGTH + len(incoming_line)) <= COMMENT_MAX_SIZE
 
 
+def _normalize_excluded_dir(path_in):
+    if os.path.isabs(path_in):
+        return os.path.realpath(path_in)
+    return os.path.realpath(f"{WORK_DIR}/{path_in}")
+
+
 def is_excluded_dir(line):
     """
     Determines if a given line is from a directory that should be excluded from processing.
@@ -219,17 +225,16 @@ def is_excluded_dir(line):
         bool: True if the line is from a directory that should be excluded, False otherwise.
     """
 
-    # In future this could be multiple different directories
     exclude_dir = os.getenv("INPUT_EXCLUDE_DIR")
     if not exclude_dir:
         return False
 
-    excluded_dir = f"{WORK_DIR}/{exclude_dir}"
-    debug_print(
-        f"{line} and {excluded_dir} with result {line.startswith(excluded_dir)}"
-    )
+    excluded_dirs = [_normalize_excluded_dir(path) for path in exclude_dir.split()]
+    result = any(line.startswith(excluded_dir) for excluded_dir in excluded_dirs)
+
+    debug_print(f"{line} and {excluded_dirs} with result {result}")
 
-    return line.startswith(excluded_dir)
+    return result
 
 
 def get_file_line_end(file_in, file_line_start_in):
diff --git a/test/test_static_analysis_cpp.py b/test/test_static_analysis_cpp.py
index d8974d8..09c8da2 100644
--- a/test/test_static_analysis_cpp.py
+++ b/test/test_static_analysis_cpp.py
@@ -210,6 +210,7 @@ def test_get_files_to_check(self):
             "",
             "c++",
         )
+        self.assertEqual(to_list_and_sort(result), expected)
 
         # Preselected files present
         expected = [f"{pwd}/utils/dummy_project/DummyFile.cpp"]
@@ -219,6 +220,7 @@ def test_get_files_to_check(self):
             f"{pwd}/utils/dummy_project/DummyFile.cpp {pwd}/utils/dummy_project/exclude_dir_1/ExcludedFile1.hpp",
             "c++",
         )
+        self.assertEqual(to_list_and_sort(result), expected)
 
 
 if __name__ == "__main__":
diff --git a/test/test_utils.py b/test/test_utils.py
index adbb77c..45209c1 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -23,6 +23,34 @@ def test_get_lines_changed_from_patch(self):
         lines = sa_utils.get_lines_changed_from_patch(patch)
         self.assertEqual(lines, [(48, 56), (1, 1)])
 
+    def test_is_excluded_dir_with_multiple_directories(self):
+        previous_exclude_dir = os.environ.get("INPUT_EXCLUDE_DIR")
+        previous_work_dir = sa_utils.WORK_DIR
+
+        try:
+            os.environ["INPUT_EXCLUDE_DIR"] = "exclude_dir_1 exclude_dir_2"
+            sa_utils.WORK_DIR = "/github/workspace"
+
+            self.assertTrue(
+                sa_utils.is_excluded_dir(
+                    "/github/workspace/exclude_dir_1/file.cpp:8:1: warning"
+                )
+            )
+            self.assertTrue(
+                sa_utils.is_excluded_dir(
+                    "/github/workspace/exclude_dir_2/file.cpp:3:1: warning"
+                )
+            )
+            self.assertFalse(
+                sa_utils.is_excluded_dir("/github/workspace/src/file.cpp:4:1: warning")
+            )
+        finally:
+            if previous_exclude_dir is None:
+                os.environ.pop("INPUT_EXCLUDE_DIR", None)
+            else:
+                os.environ["INPUT_EXCLUDE_DIR"] = previous_exclude_dir
+            sa_utils.WORK_DIR = previous_work_dir
+
 
 if __name__ == "__main__":
     unittest.main()