Drain pears; reserve juice. Cut up pears into bite-size pieces and set aside.

Add water to the pear juice to measure 3 cups. Bring to a boil. Transfer to a large bowl. Add Jell-O until dissolved. Whisk in cream cheese cubes until smooth. Refrigerate until slightly thickened.

Whisk in Cool Whip. Fold in pears.

Transfer to a glass 9x13-inch dish and refrigerate to set completely. Cut into squares to serve.