 Should you keep ketchup in the refrigerator? I think if you keep ketchup in the refrigerator, you're a nasty person. Fact. Nasty, but it's not disgusting. No, I don't think you're nasty, but I do think that it's odd, to say the least. So we're waiting for your calls. 877-242-2426. You keep ketchup in the refrigerator. It's the deal you consider.