Entomopathogenic fungi (EPF) are natural enemies which affect insect population and have long been recognized as biological control agents against many insect pests. Some isolates have also been established as endophytes, benefiting their host plants without causing any symptoms or negative effects. Here we demonstrated two entomopathogenic fungal species,Isariajavanica(Frieder. & Bally) Samson & Hywel-jone 2005 andPurpureocillium lilacinum(Thom) Luangsa-ard, Hou-braken, Hywel-Jones & Samson (2011) as endophytes in tomato plants by using the seed inoculation method and examined their effect on plant growth,B.tabacimortality, and adult emergence. Our study indicated that tomato seeds treated with a fungal suspension ofI.javanicaandP.lilacinumenabled their recovery from plant tissues (root, stem and leaf) up to 60 days after inoculation (DAI). Both endophytic isolates also caused significant mortality of adultB.tabacion seedlings inoculated with,I.javanica(51.92±4.78%), andP.lilacinum(45.32±0.20%) compared to the control treatment (19.29±2.35). Adult emergence rates were significantly high in the control treatments (57.50±2.66%) compared toI.javanica(15.00±1.47%) andP.lilacinum(28.75±4.78%) treatments. This study provides evidence that endophytic isolates ofI.javanicaandP.lilacinumhave a biocontrol potentials for used against whiteflies and could also explored as plant growth promoters.