The Protean and Boundaryless Career Attitudes scales developed by Briscoe and colleagues have facilitated research on career attitudes and mindsets, but they are unnecessarily lengthy and somewhat redundant in their content. To address these concerns, this article presents three studies that develop and validate short forms of the Protean and Boundaryless Career Attitudes scales (i.e., PCA-SF and BCA-SF). Study findings suggest that the PCA-SF and BCA-SF provide a more efficient assessment of the protean and boundaryless career attitudes constructs than the full-length measures and exhibit partial measurement equivalence across U.S. and Korean populations.