| Official Name: | Ko Lan |
| Native Name: | เกาะล้าน |
| Native Name Lang: | th |
| Settlement Type: | Island |
| Image Alt: | Ko Lan Perspective |
| Nickname: | Coral Island |
| Pushpin Map: | Thailand |
| Pushpin Label Position: | left |
| Coordinates: | 12.9158°N 100.7775°W |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type1: | Province |
| Subdivision Name1: | Chonburi |
| Subdivision Type2: | District |
| Subdivision Name2: | Bang Lamung |
| Parts Type: | Village |
| P1: | Ban Ko Lan |
| P2: | Ban Krok Makham |
| Area Total Km2: | 5.6 |
| Area Land Km2: | 5.6 |
| Length Km: | 4.65 |
| Width Km: | 2.15 |
| Elevation Max M: | 180 |
| Timezone1: | ICT |
| Utc Offset1: | +7 |
| Area Code Type: | Area Code |
| Area Code: | 038 |
Ko Lan (Thai: เกาะล้าน, in Thai pronounced as /kɔ̀ʔ láːn/) is one of the eastern seaboard islands of Thailand. Ko Lan lies 7.5 km from the nearest shore, Pattaya. "Ko Lan" is the name of the island in the Royal Thai General System of Transcription. It is also known as "Koh Larn" and "Ko Laan".
About four kilometres long and two kilometres wide occupying 3,411 rai,[1] Ko Lan is the largest of the "near islands" off south Pattaya, at the southeast end of the Bay of Bangkok, and on the east side of the Gulf of Siam. Administratively Ko Lan belongs to the Amphoe Bang Lamung, Chonburi Province.
It is an island of hills covered with low tropical forest. A Buddhist shrine is located at its highest point, 180 metres above sea level. The island has two small villages, Ban Ko Lan and Ban Krok Makhan, where there are lodgings and restaurants. Ferries connect Ko Lan to the mainland.
Most of Ko Lan's eight beaches are on its west side. Most visited is Tawaen Beach, where there is a small harbor. The beach is lined with small tourist shops and restaurants. Other beaches include Tonglang Beach, Tien Beach, Samae Beach, Tayaiy Beach, and Nual Beach.
Ko Lan has 1,567 hotel and resort rooms and two wharves.
The "Koh Larn Classic" is a sailing and running race event held at the nearby Royal Varuna Yacht Club in Pattaya. Since 2023, the Koh Larn Trail Run has taken place in February and has participants run either an 11-kilometer or 25-kilometer route around the island's trails.
Two smaller islands are near Ko Lan:
Ko Phai, the main island of Mu Ko Phai (หมู่เกาะไผ่), the group of "far islands", off Pattaya is about 14 km to the west of Ko Lan.[2]
See also: impacts of tourism and plastic waste. During low season, Ko Lan attracts about 3,000 visitors a day. In high season, as many as 10,000 people daily visit. They generate about two million baht in daily income. Its maximum daily visitor capacity is 6,410. In addition, there are up to 8,000 permanent residents and workers on the island. Visitors and island residents generate about 50 tonnes of solid waste per day, mostly waste from food and plastic containers, foam and glass bottles, but Pattaya City authorities are only able to remove 20–25 tonnes per day.[3] Pattaya City has no landfill of its own. It transports all of its waste and that of Ko Lan to a site in neighbouring Saraburi. The remaining daily 10 tonnes of refuse on Ko Lan is building up at a 12 rai sized dump site in the island's centre. There are over 50,000 tonnes of accumulated rubbish on the island. Plans existed to build a garbage recycling and separation plant by 2016.[4] It has not happened.