This study aims to adapt, provide evidence of validity, analyze the invariance across gender, and estimate the reliability of the reduced version of the Sternberg's Triangular Love Scale (STLS-R). The sample size comprises 988 Peruvians (748 females and 240 males), who had been in a relationship for at least one month, and whose ages ranged from16 to 54 years old (M=21.29; SD=3.91). Before the statistical analysis, the semantic equivalence was tested through the translation-back translation method. The results indicate that the three-dimensional STLS-R model present satisfactory goodness-of-fit in the data (χ2 (87) = 177.14; χ2/df =2.04; CFI =.99; RMSEA=.03 [.02,.04]; SRMR =.03) which is invariant with respect to gender, and show acceptable reliability regarding intimacy (ω =.91), commitment (ω =.93) and passion (ω =.86). The overall results offer sufficient valid evidence and suggest that the scale can be used in further studies. However, its effective-ness should still be tested in different regions of Peru.