Samsung Galaxy W (i8150), also known as Samsung Wonder, is an Android smartphone that is a smaller-sized variant of Samsung Galaxy S II.

Galaxy W is a less-powerful downgrade compared to Galaxy S II, with specifications comparable to the larger Galaxy R. The device has a 3.68 in (9.34 cm) WVGA capacitive TFT LCD touchscreen with a 480x800 px resolution. The phone also features a 5-megapixel still-image camera that is capable of 720p video capture.

The main differences between Galaxy W and other variants are its single-core CPU (1.4 GHz manufactured by Qualcomm), higher screen pixel density compared to Galaxy S II and Galaxy R, and a slightly different physical design.

Prior to the release of Galaxy S II, there were speculative reports of Samsung's plans for a smaller stripped-down variant, which is a similar case-example to HTC HD Mini existing as a smaller version of HTC HD2.

This phone is to not be confused with Samsung's latest revival of the Samsung Galaxy W Series.

First announced in August 2011, the Galaxy W made its market debut in October 2011.

The device uses a single-core 1.4 GHz Scorpion Qualcomm powered Snapdragon chip along with Adreno 205 for its GPU graphics.

The handset has a system memory of 1.07 Gigabytes,1.7 GB of USB Storage and a dedicated 351 Megabytes of RAM.