---
title: Null Values
framework: objectivec
role: collectionGroup
role_heading: API Collection
path: objectivec/null-values
---

# Null Values

These macros define null values for classes and instances.

## Topics

### Constants

- [nil](objectivec/nil-227m0.md)
- [Nil](objectivec/nil-565ns.md)

## See Also

### Constants

- [Boolean Values](objectivec/boolean-values.md)
- [Dispatch Function Prototypes](objectivec/dispatch-function-prototypes.md)
- [Objective-C Root Class](objectivec/objective-c-root-class.md)
- [Local Variable Storage Duration](objectivec/local-variable-storage-duration.md)