Introduction.
Amid growing labor instability, new forms of solidarity among and for workers have emerged as alternatives to trade unions. These organized forms represent an intriguing yet underexplored phenomenon within the current literature in the field of Work and Organizational Psychology (WOP).


Purpose.
This contribution seeks to frame scholarly perspectives on organizing work solidarity. It examines how solidarity is defined, the theories supporting it, its target groups, its impacts in contemporary labor contexts, and the enabling and constraining factors that shape it.


Method.
The review was conducted on Scopus, PsycINFO, and JSTOR. The process led to the inclusion of sixty-three contributions, published between 2014 and 2024, addressing conceptualizations and research on solidarity. Thematic analysis was conducted to explore emerging themes, focused on definitions of solidarity and organized solidarity, as well as enabling and hindering factors and their impacts.


Results.
The selected papers, largely sociological, identify four main approaches to defining organized work solidarity: solidarity as collective mobilization; as reciprocal and mutual help; as a "we-ness" connection; and as achievement-in-process. Targets range from traditionally unionized categories to non-standard employment. Particular attention is devoted to marginalized workers, such as those in informal and domestic labor. Enabling and constraining factors are examined across structural, organizational, relational, and individual dimensions.


Conclusions.
Workplace solidarity emerges as a heterogeneous phenomenon, simultaneously functioning as a mobilizing force, a relational practice, a process of identity formation, and a protective mechanism. It constitutes both a response to precarious employment and an innovative form of collective organization beyond unions. Its expression is strongly shaped by social, cultural, and organizational conditions, demonstrating its dynamic and context-dependent nature. Future research should explore how solidarity can be strengthened and institutionalized, particularly in non-standard and marginalized work experiences. No recent reviews within WOP studies have systematically addressed workplace solidarity and its organizational forms.