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Thai Diamond Bar B Q

4.2 (557 reviews)
ModerateThai, Soup, Barbeque
Closed • 11:00 am - 3:00 pm, 4:30 PM - 9:00 PM
Updated 2 weeks ago

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THAI DIAMOND BAR B Q ATMOSPHERE

What's the vibe?
Moderate noise
Casual
Good for groups
Good for kids

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Recommended Reviews - Thai Diamond Bar B Q

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Virginia L.

Great food! Nice quiet restaurant. Great service. I will be returning again soon! I would definitely recommend!

Jackie C.

Worse customer service. My 8 year old daughter didn't like the hard orange chicken and I asked the server if could switch the plate out and they said they cannot do it. So now I have to pay for something that my daughter didn't like. I have been coming here over 14 years and will not be coming back!

Pad See Ew
Sarlyn P.

Great price. Good Thai food. Nice ambiance. Calamari batter was light and tasty. Pad See Ew was good but they use regular broccoli (maybe I should have requested the Chinese broccoli) Chinese broccoli with fried pork was perfect! Service was fast and efficient too.

Crab Fried Rice
Danielle P.

This place is GREAT! We'd been wanting to try this restaurant for a while, and we finally had a chance to today! We were greeted promptly upon entering. Service is friendly, excellent and efficient. Very roomy and clean restaurant. They let us pick where we wanted to sit, so we chose a nice booth. It was hard to decide what to order because everything looked so good! We over-ordered and will enjoy the leftovers! Tom-kah soup is my absolute favorite and it was so delicious! The spice is served on the side, but we poured all of it in there! YUM! I hadn't had pad Thai in forever, but ordered that with chicken and it was wonderful. My daughter ordered the crab fried rice and the beef noodle soup and she loved both dishes. I also got a Thai tea and she got a Thai tea with boba. The food presentation was fabulous and portions are generous, served family style for sharing. They offer delivery on Grub Hub! We loved our lunch here and will definitely be back!

Pad Thai
Hieu H.

Service was great! We went on a weekend night, the food were served about 15 mins after ordered. Parking was not a problem for us as there're too many stores in the plaza. Pad Thai: 4.5/5. Tofu, pork, shrimp, and chicken included in the base price, beef and seafood option charges more. I'd say it's comparable to other popular Thai stores in Thai town DTLA. Good balance between noodles, peanuts, tofu, and veggies! Pork Jerky: 4/5. It's deep fried sliced pork, dip with the house special sauce. Very crispy. The sauce was good! It balances perfectly between sweet, sour, and savory. Wish the pork could be a little bit more tender. Papaya Salad: 5/5. You will love it if you love fish sauce, which I do! Recommended!

S-4 Dearest Crab Dinner (2)
Francis D.

I have been to this place several times for years but never got to review it. My family wanted Thai food so we went to this place. We ordered the Thai fried rice, dearest crab meal, and the chicken pad Thai. My two favorites were the dearest crab and the Thai fried rice. The rice was seasoned well although a little greasy. Big pieces of chicken made this a meal. The dearest crab was delightful with the 2 generous crispy fried ball. It didn't come with a sauce but I asked for the sweet chili and some of the bbq sauce they use for the spare ribs and that competence the dish well. Price wise, it is at par with other places close by. Service was quick and friendly. The place itself might need a little updating since it's a little dated but the food is worth it.

Mel B.

#7 for 2025 The overall service is generally good. The girls working the tables are polite and nice. Are attentive too making sure our drinks are filled. Parking is easy in this strip mall shared with NY Pizza. This Sunday evening was exceptionally busier than normal with most tables occupied when we entered. We were told to choose our table and settled into the last booth by a window. The menus were brought over but the water was not until after we ordered. I think they skipped a rhythm in their service. As busy as it was, and I saw a larger party submit their order before ours, the dishes came out quick. It was just my wife and I tonight. She was a bit under the weather so tonight's dinner was catered to her. TOM YUM CHICKEN $13 An excellent starter for a chilly evening to warm up our appetite. Loved the spicy lemon grass and lime flavor with the chicken and mushroom. Really helps the throat feel better too. BEEF SALAD $14 The Sliced beef marinated with lime juice, fresh chili, onion, tomatoes, and cucumber on a bed of lettuce is quite good on its own. I enjoy it better poured over my rice not to waste any of that good flavor from all the juices. SPICY CRISPY CHICKEN $13 This was a new dish for me. As many items I've had over the decades with Thai food it did not disappoint. The crispy chicken skin, bell peppers, beans with the spicy Thai curry sauce was nice and crunchy. On previous visits we've had other dishes and were also good. PAD SEE EW $14 I always get this with chicken to go with the flat rice noodles stir-fried with broccoli and egg. Place this over your rice then drizzle with soy and chili for added flavor. Could use a little more meat. GARLIC SHORT RIBS $13 Can't go wrong with ribs cooked with black pepper and garlic. That's a winning combination all day long. PAD PED CATFISH $16 This deep fried catfish stir-fried in spicy chili paste sauce is another of my favorites. Just thinking about that spicy taste makes my mouth drool. The Spicy Fish is about the same but uses tilapia instead of catfish. I feel the catfish comes off better in this cooking method than the tilapia. RED CURRY $13 All the curries are good but our go to is the red curry. Love the basil in there and wish there was a little more. Try their pineapple and pumpkin curries too. Those are not seen at other Thai restaurants so it's a bit of a treat to have them here. MANGO W/STICKY RICE (SEASONAL)12 If you're new to the Thai cuisine a must to try is the Mango Sticky Rice. Fresh sweet Mango served with sweet sticky rice and coconut milk topped with dried mung bean. That's a nice treat especially on those hot summer nights. What I like about Thai Diamond is their $12 lunch specials, Monday to Friday, from 11am to 3pm. They have a larger selection than most that includes garlic pork ribs, sweet & sour chicken, Thai bbq chicken, Thai bbq spare ribs, chicken pad thai and several more options to choose from. Now that i'm finish with this review I have a sudden urge to go back tonight.

Julie H.

This is the best Thai place in Rancho Cucamonga! I have been coming here since I was a kid and the taste has been consistent for years. Love this place!

sweet and sour soup
cat

food soup was addicting i couldn't get enough, if u come here u have to try the sweet and sour soup , i got mild (it comes with shrimp and mushroom, and it has the perfect amount of sour) crab fried rice - not my fav only bc i couldn't taste or see the crab , i would have liked more crab but fried rice paired very nicely with the soup service not bad but was very hot when i first came in i was sweating and got even hotter just sitting there , and this was before i had the soup my water was refilled before it got empty so that's always nice not awful service, not out of this world service it was just normal ambiance family friendly very standard thai restaurant nothing fancy but could use a little update since its looked exactly the same since for the past 15 years parking is always good prices are also really good i spent $32 before tip for the soup and rice and that was more than enough for two adults, we had leftovers to take home

Adnan K.

Thai Diamond Bar.B.Q. is undoubtedly the best Thai restaurant in Rancho Cucamonga. This place is always nicely decorated, clean, comfortable, and perfect for a relaxing meal. The staff is friendly and the food is always on point. Their lunch specials offer great value. The price is still affordable even with the recent price increase. Their service is consistently great and the restaurant is always very clean and well-maintained. Delicious food and outstanding service, all at a great price! If you live in Rancho Cucamonga/Ontario and love Thai food, then you should give this place a try. You'll not be disappointed!

Mango sticky rice
Wendy B.

The mango sticky rice I've been asking for all year is finally here. SOOOO GOOD!! Friendly service, great food. Very clean!

My favorite Thai restaurant!
Andrea M.

My Favorite Thai Restaurant ever! been coming here since I was a kid open so many and I don't think I'll ever go anywhere else.

Ethel C.

Our first time trying this Thai spot in Rancho Cucamonga and we loved it! The fried tofu was perfectly crispy on the outside and soft on the inside, and the peanut sauce was so yummy. The staff was super friendly and even surprised us with heart-shaped fried rice for the month of love. Definitely a must-try!

Boat Noodle Soup

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8 months ago

the curry is so so fresh and delicious!! best thai food ive had in rancho cucamonga. The fried bananas are delicious as well!

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This place is so good! The crab fried rice and the chicken pad Thai were both 10/10. Friendly customer service. Will be returning

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Thai Diamond Bar B Q - thai - Updated October 2026

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