Locke joined the Pirates from the Exeter Chiefs this season on a permanent basis having been at the Mennaye Field on a dual registration basis last season.
The 25 year old who was previously with Coventry, has enjoyed a fine season for the Cornishmen and was their second top try scorer until breaking his collarbone in January.
The Braintree born player has clearly benefitted from regular game time in the Championship and been able to show off his hard running style with ball in hand, combined with deft handling skills and strong defence.
Although he's now set to return to action and play his part in the Pirates Championship play off push, Locke is eagerly awaiting the opportunity to push his Premiership claims again.
"Moving to Gloucester is a great opportunity for me and I'm really looking forward to linking up with them.
"They're assembling a great looking squad for next season. It looks like being a really exciting season and I hope to be able to play my part.
"I do owe a huge thank you to everyone at the Pirates though and I'll be doing everything possible to see the club finish on a high this season."
Gloucester Rugby Head Coach Bryan Redpath insists that Locke will be joining Gloucester with something of a point to prove.
"Drew's had a good season with the Pirates but he didn't really get a chance to show what he can do at Premiership level when he was at the Chiefs.
"He's getting a second chance in the top flight and I know that he's coming here determined to do himself justice and make a contribution to our campaign."