Locus standi, derived from Latin meaning 'place to stand,' refers to the legal capacity or right of a person to institute or defend an action in court. In the Indian legal system, this foundational procedural concept governs who may approach a court and under what circumstances. The ordinary rule, rooted in the civil procedure framework, requires that a person bringing an action must have a direct interest in the subject matter of the dispute—their legal right must be affected by the relief sought. This principle protects courts from frivolous litigation and ensures that judicial resources address genuine grievances rather than abstract or hypothetical disputes. The Constitution of India, while not explicitly defining locus standi, implicitly recognizes this limitation through its structure of judicial review and the standing requirements embedded in civil and criminal procedure. The mechanics of locus standi operate through three interconnected elements that must align for a party to successfully invoke court jurisdiction. First, there must be a legal or constitutional right recognised by law—whether contractual, statutory, or fundamental. Second, the party asserting this right must demonstrate a direct or immediate interest in the outcome; a mere ideological concern or indirect effect is insufficient. Third, there must be a causal nexus between the defendant's action and the violation of the claimant's right. These elements do not operate in isolation. A party may possess a legal right but lack standing if their particular interest is not affected; conversely, a person deeply invested in an outcome may have no standing if the underlying legal right is not theirs to enforce. The interaction becomes particularly nuanced in constitutional litigation, where the Constitution itself has created exceptions to the ordinary rule, most significantly through the mechanism of public interest litigation, which fundamentally relaxed the traditional standing requirement. The consequences of lacking locus standi are procedural but substantial. A court will dismiss an action at the threshold without examining the merits, even if the substantive claims appear compelling. This dismissal operates as a complete bar to adjudication—the court simply has no jurisdiction to entertain the matter. The defendant may raise lack of standing as a preliminary objection, and the burden falls on the plaintiff to establish their standing before proceeding further. However, Indian courts have developed important remedies and exceptions. Through public interest litigation, recognized in the Constitution's framework, any citizen or organization may approach the court on behalf of those who cannot—persons in custody, marginalized communities, or those facing systemic violations. This exceptional standing applies when the issue concerns a fundamental right or public law violation affecting the general public. Additionally, the Constitution provides standing in certain contexts: a citizen has standing to challenge laws violating fundamental rights under the constitutional amendment provisions; a parent has standing to challenge educational policies affecting children; and taxpayers have limited standing in matters of public expenditure and misuse of state resources. The remedy for wrongful dismissal on standing grounds is review or appeal, where the appellate court will reexamine whether standing existed. Locus standi occupies a critical position within the broader architecture of Indian procedural law, intersecting with justiciability, res judicata, and the doctrine of privity of contract. The concept operates differently across civil, criminal, and constitutional domains. In civil law, the traditional contractual privity doctrine severely restricted standing—only parties to a contract could sue or be sued—though this has been substantially eroded by statutory exceptions and the recognition of tort principles. In criminal procedure, the victim or their family ordinarily has standing to prosecute or join proceedings, but the State, as representative of public interest, also possesses independent standing. In constitutional law, the paradigm has shifted most dramatically: the ordinary standing requirement has been diluted by public interest litigation and constitutional interpretation that recognizes dignitary and social interests. Neighboring concepts include 'cause of action,' which refers to the right to sue based on a specific legal claim, and 'parties,' which describes those with standing in a particular dispute. However, locus standi is anterior to both—it asks whether you have any right to be in court at all, before determining what claims you can advance. The distinction between locus standi and maintainability is also crucial: locus standi concerns the capacity to sue, while maintainability concerns whether the suit is properly constituted under procedural rules. A party with standing might file an unmaintainable suit; a party lacking standing cannot cure the defect through proper procedure. CLAT examiners frequently test locus standi by inverting expectations or introducing subtle variations that trap unprepared candidates. A common distortion presents a party with obvious emotional or financial interest but no legal right—for instance, a neighbor emotionally invested in a property dispute between others, or a creditor concerned about a debtor's ability to repay. Candidates often incorrectly grant standing based on sympathy or connection rather than legal interest. Another frequent trick reverses the traditional public interest exception: a fact pattern describes collective harm to many citizens but frames it as a matter of private commercial dispute where PIL principles should not apply, testing whether students rigidly apply rules or understand their rationale. Examiners also conflate locus standi with other barriers to adjudication, presenting a case where the real issue is res judicata or limitation, but the question falsely frames standing as the problem. A particularly insidious trap involves multiple plaintiffs: one has standing while others do not, and the question tests whether students recognize that the suit is maintainable by the one with standing, even though others must be excluded. Finally, CLAT questions sometimes import administrative law standing rules (which are broader) into civil procedure contexts, or introduce constitutional interpretation stretching locus standi beyond recognized exceptions, testing whether students understand domain-specific applications of the principle.