He made the announcement on Twitter this morning.
It will be DeLaet's first-ever appearance in a major.
The native of Weyburn, Sask., has five top-10 finishes to his credit on the PGA Tour this season alone, earning him just over US$1.5 million.
He's currently ranked 67th in the world, but he's 23rd in the FedEx Cup standings.
This year's edition of The Open is taking place in Muirfield from July 18th to the 21st.