diff --git a/src/promptforge/core/exceptions.py b/src/promptforge/core/exceptions.py
new file mode 100644
index 0000000..6497075
--- /dev/null
+++ b/src/promptforge/core/exceptions.py
@@ -0,0 +1,38 @@
+class PromptForgeError(Exception):
+    """Base exception for PromptForge errors."""
+    pass
+
+
+class InvalidPromptError(PromptForgeError):
+    """Raised when a prompt YAML is malformed."""
+    pass
+
+
+class ProviderError(PromptForgeError):
+    """Raised when LLM API operations fail."""
+    pass
+
+
+class ValidationError(PromptForgeError):
+    """Raised when response validation fails."""
+    pass
+
+
+class GitError(PromptForgeError):
+    """Raised when git operations fail."""
+    pass
+
+
+class RegistryError(PromptForgeError):
+    """Raised when registry operations fail."""
+    pass
+
+
+class MissingVariableError(PromptForgeError):
+    """Raised when a required template variable is missing."""
+    pass
+
+
+class ConfigurationError(PromptForgeError):
+    """Raised when configuration is invalid."""
+    pass
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