Objectives: The coefficient of thermal expansion (CTE) provides a measure of the dimensional stability during heating or cooling. For dental restorations, this may have an important influence on their marginal integrity: the greater the difference of CTE between tooth and restoration, the more one may expect marginal leakage. Various methods have been used to measure CTE in dental composites. Electronic speckle pattern-correlation interferometry (ESPI) is a non-contact non-destructive full-filed laser-based deformation measurement tool. The aim of this study is the determination of CTE of 5 different dental composites using ESPI. Methods: One microhybride (Arabesk Top®), two nanohybrides (Grandio Flow®,Grandio Top®) and two ormocers Admira Flow® and Admira® were tested. Five dry samples sized 15×15×1 mm3 were produced and measured 24 hours after conventional light-curing at room temperature. The samples were fixed on a Peltier-element with a thermo-paste and sub-micrometer surface deformations were measured during heating from 25°-65° by ESPI (Q300, DantecEttemeyer, Ulm, Germany). Standard aluminum with a well known CTE of 23,5*10-6 /°C was used as reference. The differences among the composites were analyzed using one way ANOVA. Results: The following CTE's (×10-6 /°C and standard deviations) were found for Admira-Flow, Admira, Arabek-Top, Grandio-Flow and Grandio-Top: 42.9 (5.9), 39.2 (6.5), 33.0 (9.4), 29.6 (3.7) and 18.6 (2.8) respectively. Conclusions: The high sensitivity of ESPI is an advantage for the non-contact and reproduciable determination of CTE in dental-composites. Both filler content matrix affect the CTE. The highly filled nanohybride Grandio Top® has a CTE closest to that found in tooth crown (11.4×10-6 /°C).