We present a comprehensive investigation of the physical properties of a candidate nodal-line semimetal GdRhPb single crystals, through magnetization, heat capacity, and magnetotransport measurements. Temperature-dependent magnetization $\left[\chi \right(T\left)\right]$ along different crystallographic directions confirm that Gd ions are in the trivalent state and exhibit antiferromagnetic (AFM) ordering below $T_{N1}=17.6 \mathrm{K}$, followed by a second magnetic transition at $T_{N2}=15.3 K$. Electrical resistivity measurement exhibits metallic behavior, followed by a sharp increase at just below $T_{N1}$, indicative of AFM superzone gap formation. These AFM phase transitions are further corroborated by the temperature-dependent heat capacity. Within the AFM state, isothermal magnetization $\left[M\right(H\left)\right]$ data reveal multiple field-induced metamagnetic (MM) transitions. Moreover, transverse and longitudinal magnetoresistance data show a sharp drop at critical fields, aligning with the MM transitions observed in $M\left(H\right)$ data. Hall resistivity analysis in the paramagnetic region indicates a crossover from single carrier-dominated electrical transport to contributions from multiple carrier types. Interestingly, a distinct humplike anomaly in the Hall resistivity below $T_{N1}$, not scaling with $M\left(H\right)$, suggests the presence of the topological Hall contribution. Additionally, the constructed $H-T$ phase diagram for $H\perp c$ reveals at least four distinct magnetic phases, highlighting the compound's complex low-temperature magnetic behavior. Furthermore, first-principles calculations reveal that GdRhPb is a topologically nontrivial nodal-line semimetal, characterized by drumhead surface states and a nonzero Berry phase.

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• First-principles calculations
• Hall effect
• Magnetism
• Magnetotransport
• Topological materials