The authors examine the influence of individual and collective voice mechanisms on employee access to and use of six work-life flexibility practices. Their multilevel analyses are based on an original survey of 897 workers nested in departments across eight unionized establishments in the United States. Collective voice measures include the effectiveness of union pay benefits and union schedule support at the individual and union (group) levels. The authors' analyses indicate that when unions are perceived to effectively support workers' schedule needs, individual access to flextime, gradual return to work, and a compressed workweek is higher. By contrast, when unions are perceived to effectively negotiate higher wages and benefits and enforce the collective agreement, individual access to flextime and a compressed workweek is lower. Collective voice measures are also significantly related to the use of a number of worklife flexibility practices. These findings suggest that union behavior can have a significant and varied influence on access to and use of work-life flexibility practices. W ith the rise of female labor force participation, the increase in dual earner couples, and the growing work and family conflict among men, a large number of U.S. employees would like more access to work-life flexibility practices, such as flextime, voluntary telework, and leave for family and personal needs (Tang and MacDermid 2010). Access to and use of these practices in U.S. workplaces, however, are often driven by managerial discretion and employer control, especially for working-class jobs (e.g., police, secretarial, and industrial workers) (Kelly and Kalev 2006). Given this situation, greater understanding is needed of the role of labor unions as a form