Samsung Galaxy S6 Specs:
BODY Dimensions 143.4 x 70.5 x 6.8 mm (5.65 x 2.78 x 0.27 in)
Weight 138 g (4.87 oz)
Samsung Galaxy Note 5 Specs:
BODY Dimensions 153.2 x 76.1 x 7.6 mm (6.03 x 3.00 x 0.30 in)
Weight 171 g (6.03 oz)
The Answer: No, probably not according to the spec sheets above.