Prepare the fennel by trimming the base of the bulb and removing any brown spots.
Half the bulb lengthwise and remove the core. Thinly slice the fennel.
Peel the orange, separate the segments and cut them in half.
Mix olive oil, vinegar, salt, and pepper in a bowl before putting fennel and oranges into the dressing.
Toss the salad and top with cranberries.