Yes — on Google Play
Steam Mobile has a Google Play listing.
App Store
On Google Play
Is Steam Mobile on Android?
About Steam Mobile
With the free Steam Mobile App, you can take Steam with you anywhere. Buy PC games and get the latest game and community news - while protecting your Steam account. Shop Steam Browse the Steam catalog of PC games from your phone. Never miss a sale again. Steam Guard Protect your Steam account and make sign in faster…
Steam Mobile is listed on both the App Store and Google Play from Valve, so you can install it on Android phones and tablets. The Play Store listing shows 100,000,000+ installs.