Updated to LO 1/2026 and LO 1/2025 · Reviewed July 2026 · Author: Francisco Javier Martín Porras, criminal lawyer and court expert · SCJE team
Every criminal proceeding starts through a door: the denuncia (bringing the facts to the authorities’ knowledge) or the querella (becoming a party from minute one). Choosing well is not a technicality: it conditions the control of the proceedings, access to the investigative measures and even admission itself. We comment on both instruments, their requirements and our strategy of choice.
In brief. In brief. The denuncia is mandatory for whoever witnesses a public offence (art. 259 LECrim). The querella makes the complainant a procedural party from admission. Private offences (insults and slander) require a querella and prior conciliation. A knowingly false denuncia and a slanderous querella turn against their author (arts. 456-457 CP).
The denuncia is written or verbal, personal or through an agent, quick and free: the reporting person is not a party and does not answer for the outcome, but neither do they control the proceedings. The querella, filed through a court agent with a special power of attorney and signed by a lawyer, makes the complainant a party from admission: they propose investigative measures, control time limits and lodge appeals. Choosing between them conditions the entire procedural position.
Our practice: querellas with an account of facts and evidence that pass the admission filter; strategic choice between the agile denuncia and the querella with party control; the intermediate route of the later appearance of the injured party under arts. 109-110 LECrim; and opposition to the admission of querellas filed against our clients, for formal defects and lack of criminal relevance.
| Element | Denuncia | Querella | Practical key |
|---|---|---|---|
| Who may file | Anyone; mandatory for witnesses of public offences | Offended party or any citizen (actio popularis) | Local authorities in thefts after LO 1/2026 (art. 105.3) |
| Form | Written or verbal, no lawyer required | Court agent with special power and lawyer’s signature | The special power must mention querella and accused |
| Position of the filer | Not a party; does not answer for the outcome | Party from admission: measures, time limits, appeals | The later appearance of arts. 109-110 is the intermediate route |
| Cost | Free and immediate | Court agent, lawyer, constructed account | Report today and appear tomorrow is always possible |
| Judicial filter | Verification unless manifestly false or not an offence | Examination of criminal relevance; possible bond (art. 280) | Inadmission is appealable; specific accounts succeed |
| Semi-public offences | Report of the aggrieved party required | Available once prosecutability condition is met | The first audit of any adverse querella is admissibility |
| Private offences | Not sufficient | Querella plus prior conciliation certificate (art. 804) | Skipping the order annuls what was done |
| Risks for the filer | Only the knowingly false report (art. 456 CP) | Reckless querella may carry costs | Reasonable reporting is protected |
Summary drawn from the Spanish source page for orientation purposes. The applicable provisions are those in force at the relevant time; each case requires individual analysis by a criminal lawyer.
Original commentary by the firm, checked against the reference work in our library: Ley de Enjuiciamiento Criminal Comentada, Lefebvre-El Derecho, 13th edition, May 2026. In economic matters and against identified persons, almost always querella; for clear offences with unknown authors or police urgency, denuncia; and one can always report today and appear as a party tomorrow.
The denuncia activates the investigation without cost; the querella gives control from day one. In economic matters and against identified persons, almost always querella; and reporting today does not prevent appearing tomorrow.
Healthcare workers and civil servants must report what they learn through their profession: documenting the report made in time is self-protection, and reporting does not turn them into accusers.
The first audit is procedural admissibility: special power of attorney, prosecutability conditions in semi-public and private offences, criminal relevance of the account. Defective querellas are opposed at admission.
After LO 1/2025 the actio popularis remains alive for associations and individuals with a proportionate bond, and LO 1/2026 opened the criminal action for theft to local authorities (art. 105.3).
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