Definition
The principle that a matter once finally adjudicated by a competent court cannot be re-litigated between the same parties — the judgment is conclusive as to all matters that were actually decided or could have been decided.
Res judicata under Section 11 CPC is one of the most fundamental doctrines of civil procedure — it gives finality to judicial decisions. The doctrine rests on two maxims: (a) 'nemo debet bis vexari' — no person should be vexed twice for the same cause; and (b) 'interest reipublicae ut sit finis litium' — it is in the state's interest that there be an end to litigation. Five conditions for Section 11 CPC: (a) former suit was decided; (b) same parties (or those claiming under them); (c) same matter in issue; (d) the matter was heard and finally decided; (e) by a court of competent jurisdiction. Also applies to Writ Court proceedings (constructive res judicata in PIL — a prior PIL bars subsequent PIL on same issue by same petitioner).
Statutory Definition
Section 11, Code of Civil Procedure, 1908: 'No Court shall try any suit or issue in which the matter directly and substantially in issue has been directly and substantially in issue in a former suit between the same parties, or between parties under whom they or any of them claim, litigating under the same title, in a Court competent to try such subsequent suit or the suit in which such issue has been subsequently raised, and has been heard and finally decided by such Court.'
Etymology & Origin
Latin 'res judicata' (thing adjudged) from 'res' (thing, matter) + 'judicata' (past participle of 'judicare' — to judge). A matter that has been 'judged' is settled — the law does not reopen what has been finally decided.
Full Legal Analysis
Res Judicata: The Finality of Justice
Res judicata is the law's insistence on finality — without it, litigation would be endless. A party defeated in court could re-file, lose again, re-file again, pursuing the same claim indefinitely. Res judicata stops this cycle: once a competent court has finally decided a matter, the decision is binding. The parties can no longer re-litigate what has been decided; the courts cannot reopen what has been closed.
Conditions for Res Judicata: Section 11
All five conditions must be satisfied: (a) Same matter directly and substantially in issue: Not just tangentially related — the very matter that was at the heart of the former suit. (b) Same parties or their privies: Res judicata binds not just the parties but also those claiming through them (heirs, assignees, successors in title). (c) Same title: Parties must be litigating in the same capacity — not, e.g., individually in the former suit and as trustee in the subsequent suit. (d) Competent court: The court that decided the former suit must have had jurisdiction to try the subsequent suit. (e) Heard and finally decided: Dismissed for default is not 'finally decided' on merits — res judicata requires adjudication on the merits.
Res Judicata in Constitutional Law
Res judicata applies to writ petitions under Articles 32 and 226. The Supreme Court in Daryao v. State of UP AIR 1961 SC 1457 held that a decision by a High Court under Article 226 operates as res judicata and bars a subsequent petition under Article 32 before the Supreme Court on the same matter. Similarly, a prior PIL decision bars a subsequent PIL on the same issue by the same petitioner — preventing petitioners from 'forum shopping' or repeatedly litigating the same public interest claim.
“Res judicata is not merely procedural — it is a foundational principle of justice. Every person deserves their day in court; no one deserves two. The finality of judgment is what gives judicial decisions their authority and what gives parties their peace.”
This Term in Indian Statutes
Code of Civil Procedure, 1908, 1908
"No Court shall try any suit or issue in which the matter directly and substantially in issue has been directly and substantially in issue in a former suit between the same parties, or between parties under whom they or any of them claim, litigating under the same title, in a Court competent to try such subsequent suit or the suit in which such issue has been subsequently raised, and has been heard and finally decided by such Court."
Res judicata: five conditions — same matter, same parties, same title, competent court, heard and finally decided
