Leave the house with the oven on?

I do it only on low temperatures, and for short trips out, and even then I am not comfortable.

Maybe an insurance adjuster could weigh in. :-) This sounds old-fashioned but my father wouldn't let my mother do it on the theory that if there was an electrical short and a nuclear meltdown in the oven, we would have less leverage in an insurance claim. And we would all yell back at him, "and if we were home when it happened? That would make it less our fault?" Much yelling all around. But it does make me wonder what ins co's say about crock pots, or leaving dishwasher or dryer running when no one's home, etc.

I do it all the time. Even with a pre-set that allows me to put everything in the oven ahead of time, and then the oven temp comes on at a set time, and the item is perfectly done when I return home. Have gone away for hours and done this. Have cooked a low heat/slow pot roast while wandering off to the ski slopes for a few hours this way, although I wouldn't typically do a meat that had to wait for heat. Don't believe I've done a turkey this way, but wouldn't be phased by it -- nor one of those frozen large lasagnes that can take almost two hours to cook. Maybe I live dangerously, but really -- when was the last time your oven caught fire???

Another, similar, favorite: put frozen croissants in oven before going to bed. Have oven set to turn on at 350 half an hour before planning to rise. Voila! Hot croissants perfectly risen overnight in the oven, then cooked and hot when I get up -- just add coffee (Trader Joe's has an assortment of frozen croissants that work beautifully this way. Have done the same thing with frozen loaves of Rhodes bread dough). I now have many of my friends doing this overnight rise/preset cook for special occasions. It really is wonderful.

I will leave my oven on and leave when I'm running the cleaning cycle. Not when there's food in it.

I'm with most everyone. If it's cooking a long time at a low temperature and doesn't need much babysitting I'll leave for short periods of time (less than an hour, and really probably more like 30 to 40 minutes). Unless there's an electrical short, I don't see how it's much of a fire hazard.

If I am cooking something at a low temperature for six or so hours, sure, I will leave the house. I make tagines frequently in the winter and unless I cook the dish overnight, it is hard not to leave while the dish is cooking.

I do it a lot. Typically when I'm braising something at a low tempurature (about 200-250 F). As mentioned above, only when I'm running a quick errand though. I've never left with the oven on for more than 30 minutes or so.
That being said, I also spend hours outside doing yard work while the oven is blasting away. I guess that's pretty much the same thing since if a fire DID flare up, I wouldn't know until it was too late anyway.

My husband will NOT let me do it. Fear of fire...

I have a couple times. Only at a low temperature, or if I'm going across the street for 5 minutes, and it's something that has a low chance of burning, i.e., a lasagne that I put in from frozen that will take forever to bake. I wouldn't risk it otherwise.

I mean OVEN.