This study aims to adapt Sternberg Triangular Love Scale (STLS) and its revised form of Sternberg Triangular Love Scale-Modified (STLS-M) to Turkish, analyze the validity and reliability of the scales, and assess the psychometric equivalence (measurement invariance) of two scales across groups. The study included two sample groups compromising of 408 (284 females, 124 male) university students who were involved in a romantic relationship and 632 (372 females, 260 male) university students who were not involved in a romantic relationship; the students were enrolled in various faculties of a public university in Turkey. Confirmatory factor analysis was used to examine the construct validity of the two scales. The result of the analyses showed that both the STLS and STLS-M constituted three factors that are called "intimacy", "passion", and "commitment". The Cronbach's alpha coefficients of the factors for the STLS were 0.91 for intimacy, 0.88 for passion, and 0.93 for commitment. The reliability coefficients for the STLS-M were also 0.88, 0.83, and 0.89 respectively. Consequently, the findings of the study exhibited that both the STLS and STLS-M had a similar construct, indicating very good psychometric properties, and met the criteria for measurement invariance.