  In this work, we study the weak gravitational lensing in the background of
Kerr-Newman black hole with quintessential dark energy. Initially, we compute
the deflection angle of light by charged black hole with quintessential dark
energy by utilizing the Gauss-Bnnet theorem. Firstly, we suppose the light rays
on the equatorial plane in the axisymmetric spacetime. In doing so, we first
find the corresponding optical metrics and then calculate the Gaussian optical
curvature to utilize in Gauss-Bonnet theorem. Consequently, we calculate the
deflection angle of light for rotating charged black hole with quintessence.
Additionally, we also find the deflection angle of light for Kerr-Newman black
hole with quintessential dark energy. In order to verify our results, we derive
deflection angle by using null geodesic equations which reduces to the
deflection angle of Kerr solution with the reduction of specific parameters.
Furthermore, we analyze the graphical behavior of deflection angle $\Theta$
w.r.t to impact parameter $b$. Our graphical analysis retrieves various results
regarding to the deflection angle by the Kerr-Newman black hole with
quintessential dark energy.
