The leaves on my tomato plants are turning yellow but the tomatoes look good.
How Do I Correct My Tomato Leaves Turning Yellow
Certified GKH Gardening Expert
It really depends on the cause. There are a number of reasons for leaf yellowing in tomatoes. This article should help with pinpointing and correcting the cause of yours: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm