Good practice

Peru's Electoral Gender Parity and Alternation Reform (Ley N° 31030, 2020)

Peru's Law 31030 (2020) mandated 50/50 gender parity and strict alternation in all party candidate lists. Women's share in Congress rose from 27.7% (2016) to 38.2% (2021) — the highest in Peruvian history. Certified by ONPE and commended in the 2022 UN/CEDAW review.

27.7% → 38.2%

Women in Congress (2016–2021)

Details

Maturity: Established
Promoter: Congreso de la República del Perú
Period: 2020–present
Keywords: public sector, electoral reform, parliament, gender equality

Context

Peru's Law 31030 (2020) mandated 50/50 gender parity and strict alternation on all party candidate lists.

Results

Women's share of Congress rose from 27.7% (2016) to 38.2% (2021) — the highest in Peruvian history — certified by ONPE and commended in the 2022 UN/CEDAW review.

Implementation

Implementation detail (cost, timeline, staffing, conditions for success) is not yet available for this practice.

Data sources

Where this practice's information was retrieved from, and when.

C-NAPSE web research — accessed 2026-06-23
Congreso de la República del Perú — accessed 2026-06-23
ONPE – Paridad y Alternancia en Elecciones Generales 2021 — accessed 2026-06-23
Official Law 31030 text – El Peruano — accessed 2026-06-23
OHCHR/CEDAW 2022 Peru review — accessed 2026-06-23
Defensoría del Pueblo – Participación política report — accessed 2026-06-23
Eurosocial – Promotion of parity in Peru — accessed 2026-06-23

Quality score: 96/100

How is this calculated?

Evidence: Observational / pre–post

Top 4% in this catalogue (719 scored practices)

Scores cluster high, so position within the catalogue is often more telling than the number alone.

Evaluation

Evaluated by C-NAPSE

Score profile — the dimensions behind the score — how it's computed

Transferability / replicability2/3

The parity-alternation (zipper) model has been explicitly replicated in Bolivia, Ecuador and Chile, but effective enforcement depends on party culture and horizontal parity rules not yet universal.

Impact on gender equality1/1

Women's share in Congress rose from 27.7% (36 seats) in 2016 to 38.2% (50/130 seats) in 2021, a measurable 10.5 pp increase directly tied to the law's first application.

Effectiveness1/1

All ten competing parties complied with parity-alternation requirements in the 2021 candidacy lists, demonstrating effective enforcement at the candidacy stage.

Efficiency1/1

The reform consisted of a single legislative amendment at negligible direct cost, yielding a 10.5 percentage-point increase in female representation.

Evaluated outcomes1/1

ONPE published a dedicated post-election working document, the Defensoría del Pueblo issued a formal report, and CEDAW's 2022 Peru review cited the law's outcomes.

Sustainability1/1

Parity and alternation are embedded in Peru's Organic Electoral Code and were applied in 2022 regional elections, though horizontal parity provisions face political challenge.

Achievement / evidence1/1

38.2% women in the 2021 Congress is the highest in Peruvian history and placed Peru among the top ten Latin American legislatures by women's share (IPU 2021).

Gender-mainstreaming embedding1/1

The law embeds gender parity as a structural requirement across all electoral lists for all parties, making alternation the default rather than an opt-in incentive.

Curator validation1/1

Documented by ONPE, Defensoría del Pueblo, OHCHR/CEDAW and eurosocial.eu; all figures traceable to official sources.

Cite this

Evidoria. Peru's Electoral Gender Parity and Alternation Reform (Ley N° 31030, 2020). Persistent ID: 05db004b-7d9f-440a-973f-7060f75b1d30.

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