Background and Objective: Wild plants had been recognized to have chief roles for many populations to provide them with many requirements, also, these plants have been applied for the treatments of various complaints, especially microbial infections. This study aimed to identify the inhibitory effects of watery extracts obtained from Viscus album and Apium graveolens against the number of clinical bacterial isolates. Materials and Methods: Aqueous extracts of Viscus album and Apium graveolens were applied to examine their effects on inhibition of growth and some physiological parameters such as swarming and biofilm-formation against 19 clinical bacterial isolates (Gram-positive and negative). Method of agar wells-diffusion, tissue culture plate method for biofilm inhibition test, inhibition of adherence and swarming assay were applied for estimating and evaluating the inhibitory effects. Results: Viscus album and Apium graveolens extracts showed significant inhibitory effects against most tested Gram-positive and negative bacterial isolates with inhibitory ranges 20-35 and 18-28 mm, respectively, also with significant strong inhibition of adhesion and biofilm formation by Viscus album when compared with less inhibition by Apium graveolens. Conclusion: Aquatic extracts of Viscus album and Apium graveolens can be considered beneficial prophylaxis and treated against a wide range of pathogenic bacteria.