I am allergic to fish and sea food, are there substitutes to fish or oyster sauce

At a large Asian market, I have found "Vegetarien Fish Sauce, Nuoc Mam Am Chay" -- ingredients: Soya Sauce, salt, sugar, water, chili, acid citric, .1% sorbic acid. I can't compare its taste to authentic fish sauce, but it does make a good addition to recipes that call for fish sauce. Reasonable -- 22 fl. oz. for $3.19.
The store also carries a Kikkoman Worcestershire sauce that has no fish or seafood ingredients. Not Bulldog Sauce, which is made with dried sardine extract.
I love kecap manis, but I don't think it gives you the taste of fish sauce.

Fish sauce is often used as a substitute for soy sauce. It should work the other way around. That or the miso idea (check ingredients to make certain no fish or kombu as kombu is a seafood too).

Fish sauce substitute?
Thai light soy sauce. The light body mimics the consistency of fish sauce but it’s a little sweeter and has less of a tendency to overpower what it’s mixed into, like darker soy sauces do. Oh yeah, it’s usually cheaper than fish sauce, too. You can find it easily at Asian markets.

There are mushroom flavored soy sauces that are very tasty as an alternative to fish sauce, and for oyster sauce I would use Indonesian "Kecap Manis" which is also called sweet soy sauce that is very syrupy and delicious, easily found at an Asian market.

I would suggest Maggi sauce. A condiment popular throughout the Asian Pacific. At least according to the label it does not include anchovies but it might be wise to check further.

Since I'm assuming you looking to make other sauces and marinades; I would use a dark miso paste or black garlic to add the funky and umami notes. You may need to add a teaspoon or few of water (or stock, vinegar, mirin, or any liquid) to get the correct consistency in the final dish.

On black garlic: I totally thought it was just some trendy-fad thing not worth tracking down when I started reading about it everywhere earlier in the year. But then a couple weeks ago there was no good-looking garlic heads at my grocery store but they did have packages of black garlic sitting right there so I picked one up and it is truly as amazing as all of the hype. So sticky and funky and perfect. Given the premises of your question I highly recommend ordering it online if no stores near you carry any.

Sorry If I got carried away, if you were only looking for a fish or oyster sauce sub you can use Susan W and Nancy's suggestions I get excited talking about food!

a few suggestions -
1) There are recipes for homemade vegetarian replacement/substitute for fish sauce. If you can't find one, let me know & I'll post one on this site.
2) I think there is now a vegetarian version of Worcestershire sauce, itself a knock-off of Asian fermented fish sauces.
3) For umami flavors, look to fermented tofu or other non-fish foods

Here is a recipe for Vegan Fish sauce from the Kitchn. I haven't tried it, but I like the ingredients. I make a lot of dashi for hot and sour soup in the winter, so I would use Kombucha for the seaweed, but they use Wakame.

http://www.thekitchn.com/recipe-vegan-fish-sauce-130535

Amazon carries a vegan oyster sauce, but there are recipes for that online as well. Also, check the ingredients on the Golden Mountain Seasoning Sauce. That has a lot of umami flavor, but I haven't looked at the label in a while.



https://www.amazon.com/Vegetarian-Oyster-Sauce-17-oz/dp/B005XNKITW

Please check the ingredients before taking my recommendations. That said , Hoisin sauce is great, duck sauce, sriracha, not a sauce but Chinese 5 spice powder can be used to flavor whatever you are making. You can also build sauces using soy sauce as a base, honey garlic sauce for example. Chinese peanut sauce, satay sauce. I am sure you can find some recipes on FOOD52. I didn't even touch on Korean and Japanese cuisines. So much yu can do, lot's of options out there for you but like I said please check the ingredients on any store bought sauces.