Impatiens auricoma (sold under the name of 'Jungle Gold') has yellow flowers. Pansies will flower in shade.

There are some hosta that are very golden/yellow hostas....perhaps one of them would work for you?
Linda C

Trollius!

Going back to Busy Lizzies, there's a new-ish range out called 'Sunkissed', including 'Sunkissed Apricot' and 'Sunkissed Lemon'.

Oh, and Begonia can take some shade.

Impatiens Fusion Glow. They are yellow. I needed some yellow for my shady north side of the house. My entry garden has lots of yellow flowers to complement the house colors. However, most of the yellow flowers are for sun. That was fine for the parts that faced east and south but the walkway passes the garage to the entry which is on the north side. I was worried I couldn't find flowers to plant there. I just happened upon the yellow impatiens in Walmart.

Or mimulus? Can't they grow in shade? They're pretty cool. Nasturtiums! They'll grow in shade. There are several different yellow or yellow/cream nasturtiums out there.

Amanda 'romando'

mimilus? What's that? That rings a bell. I got a vague recollection of seeing it at the nursery. Can you describe it please? I second yellow/cream nasturtiums but I'm not sure how much shade they will take. I have mine in full sun right now and their are blooming like crazy. But its not really all that hot yet where I live. Do you grow yours in full shade?

I agree, mimulus is good for shade, but... they come in yellow?! I've only seen pink/purple/white. Must Google!

Vinelover, mimulus is also called monkey flower. It's cool! I've seen solid yellow, both soft yellow and bright yellow, and yellow with red splotches in the throat. And true, most people plant nasturtiums in full sun (the packages say to do so) but they grow like crazy down at a creek near my house that gets nearly all day shade. Some of the leaves are as big as grapefuits! They're good eats, too; kinda peppery in salads.

Amanda 'romando'

Tuberous begonias 'NonStop' variety come in yellow and do nicely in the shade.

Thanks Amanda! I'll have to check out that MonkeyFlower.

Monkey flower. Stunning, attracts hummers. Park seed wholesale is where I got mine. This plant has the wow factor.