Yep! I am using it on a L502x Dell, and the L502x will undoubtedly work!

From researching your model number it looks like there's two version of your laptop. One that has 2 RAM memory slots and one the has 4 memory slots. If you have the version with 2 memory slots you can only upgrade up to 8gb (2 - 4gb cards), and if 4 slots up to 16gb (4 - 4gb cards). This specific model of RAM doesn't look like it will work for your laptop model because it is 2 - 8gb cards and that configuration will not be compatible with your laptop.

You can go to the dell website under product support and get more specific info on your laptop (using serial number) if you're apprehensive about opening the back cover to check the number of RAM card slots yourself. The first thing you need to know is the number of ram slots in your laptop before you can proceed. All of the other specs on this ram are a match: DDR3-1600Mhz PC3-12800 is what you need.

Worse case scenario just call Dell, provide your serial number and tell them you're looking to upgrade RAM and need to know what's compatible

I bought this RAM (brand new) from Bestbuy because I got it for just 100 bucks from them. I installed this RAM on my Macbook Pro 15inch mid-2012 edition laptop. It fits perfectly and works like a charm.