The Sony Xperia 5 II^{[lower-alpha 1]} is an Android smartphone marketed and manufactured by Sony Mobile.^[5] Part of Sony's flagship Xperia series, the phone was announced on September 17, 2020.^[6] A less expensive and more compact variant of the Xperia 1 II, the Xperia 5 II belongs to Sony's handset lineup of 2020, which includes the flagship Xperia 1 II and the entry-level Xperia 10 II.^[7] The phone was released worldwide in October 2020.

The Xperia 5 II ships with support for 5G NR in Europe and Asia (making it Sony's second Xperia device to support this network), while the United States will ship with a 4G variant. Although 5G networks are supported, it only supports "sub-6" 5G, meaning it is not compatible with millimeter-wave (mmWave) networks.

The Xperia 5 II retains Sony's signature square design that is seen on previous Xperia phones. It is built similarly to the Xperia 1 II, using anodized aluminum for the frame and Corning Gorilla Glass 6 for the screen and back panel, as well as IP65 and IP68 certifications for water resistance. The build has a pair of symmetrical bezels on the top and the bottom, where the front-facing dual stereo speakers and the front camera are placed. The left side of the phone contains a slot for a SIM card and a microSDXC card, while the right side contains a fingerprint reader embedded into the power button, a volume rocker and a shutter button. A dedicated Google Assistant button is located between the power and shutter buttons. The earpiece, front-facing camera, notification LED and various sensors are housed in the top bezel. The bottom edge has the primary microphone and USB-C port; the rear cameras are arranged in a vertical strip. The phone ships in four colours: Black, Gray, Blue and Pink.