Yes, but..,
“ The bottom line

Coffee contains caffeine, a diuretic compound that can increase urination frequency.

That said, it takes drinking large amounts, such as 5 cups of brewed coffee or more at once, for it to have a significant dehydrating effect.

Instead, drinking a cup of coffee here or there is hydrating and can help you reach your daily fluid needs.”
— https://www.healthline.com/nutrition/does-coffee-dehydrate-you#bottom-line