---
title: "Writs of Mandamus and Prohibition, and Other Extraordinary Writs"
citation: "Fed. R. App. P. 21"
authority_id: "AUTH-FRAP-21"
authority_type: "rule"
jurisdiction: "federal_nationwide"
precedential_status: "binding_current_rule"
official_url: "https://www.uscourts.gov/sites/default/files/document/federal-rules-of-appellate-procedure.pdf"
url: "https://jason93.com/legal/federal-process/authorities/AUTH-FRAP-21/"
legal_review: "2026-08-25"
links_checked: "2026-10-15"
links_available: 1
links_checked_count: 1
license: "CC BY 4.0"
---

# Writs of Mandamus and Prohibition, and Other Extraordinary Writs

## Holding or rule used

Current appellate extraordinary-writ petition, service, record, answer, and proceeding mechanics.

## Material limitation

Use only for the bounded proposition in the linked modules. The exact judgment, jurisdiction, circuit, custody, other remedies, current agency instructions, requested relief, grant terms, and independent law remain separate where identified.

## Official source and pinpoints

Fed. R. App. P. 21, Rule 21(a)–(c): <https://www.uscourts.gov/sites/default/files/document/federal-rules-of-appellate-procedure.pdf>


## Used in

- [Extraordinary Writs — Coram Nobis, Audita Querela, and Mandamus](https://jason93.com/legal/federal-process/modules/60-post-conviction/extraordinary-writs-coram-nobis-audita-querela-and-mandamus.md)