It would be helpful to know
1) Where you live
2) What kind of uke are you looking for
3) What's your budget
There are tons of builders in the US and UK, not so many in other places. Prices of course wary hugely, as do building styles.
In the UK I can think of Tinguitar and KM ukulele, Andy's ukes and Ken Timms. These are good builders and all round nice people. There are other big names but for some their ego and ethos overshadows their work.
Also check out Bruko and Tom Ziegnenspeck
I live in Finland so Europe is the easiest for me.
I'm looking for a tenor scale ukulele mainly for jazz and latin/Spanish style playing in the range of 500-1500 euros.
Ah, a fellow Finn! May I direct you to a local luthier? I very recently commissioned a soprano from Lottonen Guitars: http://lottonen.com/fi/laulu/
I can easily vouch for his competence. He's fixed a couple of my more expensive ukes previously, one of which was a vintage Martin, and did an excellent job. I've also seen and tried a few ukes he's made and they are excellent quality. Of course, when he delivers the soprano I ordered I will post some pictures but that will take a few months until it's ready.
There have been other good suggestions already here. Ken Timms mainly does sopranos and they're also really hard to get since he always auctions them on eBay. Barry Maz at Got a Ukulele has recently said very good things about KM ukuleles. You might want to ask Kevin Mulcock himself if he's taking any orders in. Rob Collins at Tinguitar is supposedly another excellent builder.
Brüko is a nice suggestion as well and probably the most affordable one you'll come across. You might want to check out some videos and reviews about them because they have a very distinctive sound to them. Ziegenspeck ukes you can buy straight from Thomann.
Another interesting one is Antica Ukuleleria in Italy (https://www.anticaukuleleria.com/). I believe you can order straight from them, they might have some in stock, and you can also sometimes find their models on Gute Ukulele (https://gute-ukulele.de/ website is in German but Google Translate works fine).
Ah, a fellow Finn! May I direct you to a local luthier? I very recently commissioned a soprano from Lottonen Guitars: http://lottonen.com/fi/laulu/
I can easily vouch for his competence. He's fixed a couple of my more expensive ukes previously, one of which was a vintage Martin, and did an excellent job. I've also seen and tried a few ukes he's made and they are excellent quality. Of course, when he delivers the soprano I ordered I will post some pictures but that will take a few months until it's ready.
There have been other good suggestions already here. Ken Timms mainly does sopranos and they're also really hard to get since he always auctions them on eBay. Barry Maz at Got a Ukulele has recently said very good things about KM ukuleles. You might want to ask Kevin Mulcock himself if he's taking any orders in. Rob Collins at Tinguitar is supposedly another excellent builder.
Brüko is a nice suggestion as well and probably the most affordable one you'll come across. You might want to check out some videos and reviews about them because they have a very distinctive sound to them. Ziegenspeck ukes you can buy straight from Thomann.
Another interesting one is Antica Ukuleleria in Italy (https://www.anticaukuleleria.com/). I believe you can order straight from them, they might have some in stock, and you can also sometimes find their models on Gute Ukulele (https://gute-ukulele.de/ website is in German but Google Translate works fine).
Two more British luthiers that I've been tempted to try are Liam Kirby of Wunderkammer Musical Instruments and Paul Bernard of Wildcat Ukulele. I've not tried either, but have considered commissioning from both.
There is also (in the UK) Pete Howlett who lives and works in North Wales. His instruments are fabulous.