What Is Particular Social Group? The Category Explained

Last updated: 5 October 2026

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Particular social group is the most flexible ground for asylum under the 1951 Refugee Convention. It protects people who do not fit the other four grounds of race, religion, nationality, or political opinion. Moreover, courts have used it to protect women, LGBTQ+ people, family members, former soldiers, and people with disabilities. However, the meaning of "particular social group" (PSG) is also the most contested part of refugee law. Judges in the UK, US, and EU have developed different tests over time.[1]

This asylum guide explains PSG in simple words. First, we cover the two main legal tests. Then we look at who qualifies, key case law, and common mistakes. Finally, we show how expert witnesses help prove PSG membership. Therefore, by the end, you will understand why PSG matters and how to use it in your claim.

The Legal Definition of Particular Social Group

The 1951 Convention lists "particular social group" as one of the five grounds for refugee status. However, it does not define the term. As a result, courts have built the meaning case by case over 70 years. Today, two main tests exist. The first is the "protected characteristics" test. The second is the "social perception" test. UNHCR recommends that states use both tests together. This way, more people can access protection.[2]

The protected characteristics test asks whether the group shares a trait that its members cannot change. The trait can be innate, such as sex or sexual orientation. It can also be unchangeable for other reasons, such as past events or shared history. Alternatively, the trait can be so fundamental to human dignity that members should not have to change it, such as religion or political belief.

The social perception test asks whether the group is seen as distinct by the wider society. The society may treat members differently, exclude them, or single them out. You do not need to prove that the group is formally organised. Likewise, you do not need every member to know each other. What matters is that society sees the group as a recognisable unit.[3]

PSG Tests Compared Across Jurisdictions

Different countries apply the PSG tests in different ways. Some use only the protected characteristics test. Others use only the social perception test. A few apply both. The table below compares how the UK, US, EU, Canada, and Australia handle PSG.

Who Qualifies Under PSG

Over the years, courts have accepted many groups as PSGs. Below are the most common categories. However, every case depends on the facts. A group accepted in one country may not be accepted in another. Consequently, good legal advice is essential.

LGBTQ+ People

Courts widely accept LGBTQ+ people as a PSG. Sexual orientation is seen as an innate or unchangeable characteristic. In the UK, the Supreme Court ruled in HJ (Iran) [2010] that LGBTQ+ applicants do not have to hide their identity to avoid persecution. The US Board of Immigration Appeals has recognised "homosexual Cuban men" and similar groups since Matter of Toboso-Alfonso (1990). Today, around 67 states still criminalise same-sex relations, so LGBTQ+ claims remain common.[4]

Women Facing Gender-Based Violence

Women can form a PSG when the state fails to protect them from gender-based violence. The UK House of Lords confirmed this in Shah and Islam [1999]. The case involved Pakistani women who faced false adultery charges and domestic violence. The court held that "women in Pakistan" formed a PSG because society treated them as subordinate. Women facing female genital mutilation (FGM), forced marriage, or "honour" violence also often qualify.

Family Members of Targeted Persons

Family ties can create a PSG. If a persecutor targets your relative, your whole family may face risk. The US Fourth Circuit ruled in Crespin-Valladares v Holder (2011) that "family" is the "prototypical example" of a PSG. Likewise, UK and EU courts accept that relatives of activists, journalists, and gang targets form a social group.

Former Military and Police

Former soldiers and police officers sometimes form a PSG. Their past service is an unchangeable trait. For example, former Afghan army members face Taliban attacks since 2021. In the US, Matter of Fuentes (1988) recognised former police officers as a PSG in some contexts.

People with Disabilities and Clan Members

People with visible or lifelong disabilities can form a PSG, especially in countries where they face extreme stigma. Clan members from Somalia have also been recognised. Clan identity is seen as unchangeable and socially distinct. For more country context on clan persecution, see our country reports.

Key Case Law on Particular Social Group

PSG law rests on landmark cases from several countries. Understanding these cases helps you and your lawyer shape your claim. Below are the most important decisions in the UK, US, and EU.[5]

UK: Shah and Islam [1999] and HJ Iran [2010]

Shah and Islam v Secretary of State for the Home Department [1999] UKHL 20 is the leading UK case on PSG. The House of Lords ruled that "women in Pakistan" could form a PSG. The judges used the protected characteristics test. Furthermore, they held that state failure to protect was part of the persecution. HJ (Iran) and HT (Cameroon) v Secretary of State for the Home Department [2010] UKSC 31 confirmed that LGBTQ+ people form a PSG. The court rejected the "reasonable tolerability" test. As a result, no one should have to hide who they are to avoid persecution.

US: Matter of Acosta [1985]

Matter of Acosta, 19 I&N Dec 211 (BIA 1985) is the foundation of US PSG law. The BIA held that a PSG must share a common, immutable characteristic. The characteristic can be innate or linked to past experience. Later cases added two more tests: "particularity" and "social distinction." Today, US applicants must prove all three elements.[6]

EU: CJEU Joined Cases C-199/12 to C-201/12 (X, Y, Z)

The Court of Justice of the European Union (CJEU) ruled in X, Y and Z v Minister voor Immigratie en Asiel (7 November 2013). The case concerned gay men from Sierra Leone, Uganda, and Senegal. The CJEU held that criminal laws against same-sex conduct may amount to persecution. Moreover, applicants cannot be expected to hide their sexuality. This case shapes EU asylum practice today.[7]

A particular social group is a group of persons who share a common characteristic other than their risk of being persecuted, or who are perceived as a group by society. The characteristic will often be one which is innate, unchangeable, or which is otherwise fundamental to identity, conscience or the exercise of one's human rights.
UNHCR, Guidelines on International Protection No. 2: Membership of a Particular Social Group (2002), para 11

Common Mistakes in PSG Claims

Avoiding these mistakes starts at the witness statement stage. Therefore, work with your lawyer to frame the group carefully. Moreover, use expert evidence to show how society treats your group.

How Expert Witnesses Establish PSG Membership

Expert witnesses are vital in PSG cases. A country expert explains how the wider society treats your group. Furthermore, the expert links your personal story to documented patterns of harm. For instance, in a case about Afghan women, an expert can confirm that the Taliban targets women who worked for NGOs. In a case about LGBTQ+ Nigerians, an expert can explain how police and family members enforce anti-gay laws. This evidence supports both the "social perception" and "protected characteristics" tests.[8]

Expert reports are especially useful when the PSG is not well known to the judge. For example, cases involving specific clans, sub-ethnic groups, or unusual family structures often need expert input. The expert can also address why internal relocation inside your country is not safe. To find a qualified country expert for your PSG claim, use our expert witness directory. For more background on country-level human rights issues, see our human rights coverage.

Conclusion

Particular social group is the most flexible but also the most complex refugee Convention ground. Two main tests exist: protected characteristics and social perception. Different countries apply these tests in different ways. However, many groups are widely accepted, including LGBTQ+ people, women facing gender violence, and family members of targets. Key cases such as Shah and Islam, HJ Iran, and Matter of Acosta shape the law today. Moreover, expert witness evidence is often decisive. With careful framing and strong country evidence, PSG claims can succeed in the UK, US, EU, and beyond.