Article 515686S GOXXX10.1177/2158244013515686Sircova et al.Sircova et al. 9 , & 54 members of the International Time Perspective Research Project (presented in alphabetical order by country): Slimane Djarallah 10 , Mohamed Seghir Chorfi 11 , Umbelina do Rego Leite 12 , Hui Lin 13 , Houchao Lv 14 , Tomislav Bunjevac 15 , Tena Tomaš 15 , Jasmina Punek 15 , Anica Vrlec 15 , Jelena Matić 15 , Marko Bokulić 15 , Martina Klicperová-Baker 16 , Jaroslav Koštl 16 , Riin Seema 17 , Arno Baltin 17 , Themistoklis Apostolidis 18 , Daphne Pediaditakis 19 , Fay Griva 20 , Fotios Anagnostopoulos 20 , Nurit Carmi 21 , Marina Goroshit 21 , Martina Peri 22 , Yumi Shimojima 23 , Koichi Sato 24 , Keita Ochi 25 , Antanas Kairys 26 , Audrone Liniauskaite 27 , Víctor Corral-Verdugo 28 , Aneta Przepiorka 29 , Agata Blachnio 29 Abstract In this article, we assess the structural equivalence of the Zimbardo Time Perspective Inventory (ZTPI) across 26 samples from 24 countries (N = 12,200). The ZTPI is proven to be a valid and reliable index of individual differences in time perspective across five temporal categories: Past Negative, Past Positive, Present Fatalistic, Present Hedonistic, and Future. We obtained evidence for invariance of 36 items (out of 56) and also the five-factor structure of ZTPI across 23 countries. The short ZTPI scales are reliable for country-level analysis, whereas we recommend the use of the full scales for individual-level analysis. The short version of ZTPI will further promote integration of research in the time perspective domain in relation to many different psycho-social processes.