It is well known that the plant phenols have a wide range of positive effects, but it is less known that fruits and leaves of Croatian cornelian cherry are rich in phenolic compounds. Certain studies have already proven strong antioxidant, cardioprotective, neuroprotective and anticancer effects of cornelian cherry fruits and other plant parts extracts. Therefore, the aim of this paper was to analyse fruits, leaves and pulp of the Croatian cornelian cherry and food products from cornelian cherry such as jams and syrups as suitable sources of polyphenols for everyday use. Samples of dogwood and its products were collected from the wider area of the city of Rijeka and on the area of the Primorsko-goranska County. Extraction of the plant phenols dogwood samples and corresponding products were done by use of methanol solution. The Folin-Ciocalteu test was used to determine the total phenol content, while antioxidant activity was evaluated by the DPPH (2,2-diphenyl-1-picrylhydrazyl) method. The amount of phenolic compounds and antioxidant activity was highest in leaf samples, while the total phenolic composition and antioxidant activity was lowest in the cornelian cherry food products. Differences in the results between individual samples can be attributed to the level of fruit and leaf maturity, geographical location of cornelian cherry plantations and time of sample collection. Analysis of the cornelian cherry fruit methanol extracts polyphenolic content was performed by use of a coupled mass spectrometer with a hybrid analyzer (LC-Q-TOF). By comparison of the obtained spectra with the databases, three anthocyanins (cyanidin 3-glucoside, delfinidine 3-galactoside and cyanidin 3-O-rutinoside), two anthocyanidins (pelargonidine and cyanidin) and five phenolic acids (tartaric acid, malic acid, quinic acid, gallic acid and chlorogenic acid) were identified. This paper provides data on the Croatian cornelian cherry total phenolic composition and the corresponding quantitative composition of anthocyanidins and phenolic acids.