Hi Larry!

A rectangular sink often complements a rectangular mirror beautifully, reinforcing clean, modern lines. That said, the sink shape doesn’t have to match the mirror exactly—it’s more about the overall vibe. For a softer look, a round or oval sink can create a nice contrast while still feeling modern. Think about the balance and how the sink ties into the rest of your bathroom's design elements. 😊

If you need professional help with your project, you can contact me through my Houzz profile.

The mirror and vanity proportions/styles have a big influence, so be sure to consider the overall effect.

A rectangle will look best, as long as you show your vanity selection and it suits a rectangle and, the overall vibe in the bath. There are many definitions of "modern" and your own personal definition may be different than anyone here.

Many people select an oval under mounted sink to complement the lines of the toilet and tub. Also an oval cutout provides more countertop space if your vanity is small.

I've had both, and I find the oval easier to clean. Not a big deal but something I would consider if I had to replace a sink.

I need to see your other choices this is one of many needed to bring a space together and usually I choose a mirror last

I am not in town to take a photo of current stage of remodel. This photo is the old bathroom showing the layout which is the same. (minus the tall old radiator)

Tub and wall tile.

Floor tile, Moen brushed gold fixtures, and Kohler medicine cabinet.

It's a TRANSITIONAL bath. I'd get the smallest American standard oval.....because ALL the smaller rectangles and squares? Good luck rinsing these with shaving hair and toothpaste. You are warned: )

Maureen: the photos you attached are gorgeous! Definitely not what my bathroom looks like (I wish!) and comparing those to my bathroom, and Jan's comment below, my bathroom isn't modern. I chose modern faucet but I guess the rest isn't modern.