What languages are spoken in Laos?

Answer 1

laotian
They speak Laotian, or Lao, which is very similar to Thai. There are various dialects that different hill tribes speak too, which are quite different from Laotian.
In Laos, they speak Lao.

Some might speak Thai, but the main language is Lao
...with lao, or laotian, being number 1.

following are thai, english, and french

along with small populations of chinese, hmong, and khmer-speaking people.
Lao, english, and french
Laotians speak Lao, and then French in official circles--but no longer as an official language.
Laos

Answer 2

The 1 official language of Laos is Lao. However, only slightly more than half of the population can speak Lao.

French is the the most widely spoken foreign language, with English increasing in usage.

Here is a mostly complete list of the languages of Laos:

1. Lao, Vientiane
2. Lao, Luang Phrabang
3. Lao, Sawanakhet
4. Lao, Pakse
5. Lao-Kao
6. Lao-Khrang
   
7. Akeu
   
8. Akha
9. Alak
10. Arem
11. Bahnaric
    
12. Bana
13. Bantang
14. Bisu
15. Bit
16. Bit–Khang
17. Brao
18. Bru
19. Cantan
    
20. Cauho
21. Chut
22. Cosao
23. Cuoi
24. Duan
    
25. French
26. Halang
27. Hani
28. Hani s
29. Hmong
30. Iu Mien
    
31. Jeh
    
32. Jru'
33. Juk
34. Kaloeng
    
35. Katu
36. Khir
    
37. Khmu
38. Khongsat
39. Khün
40. Kiorr
41. Ksingmul
42. Kuy
43. Lamet
    
44. Laopan
    
45. Laoseng
46. Laven
    
47. Lavi
48. Mal
    
49. Maleng
50. Mienic s
51. Mlabri
52. Muteun
53. Nguồn
    
54. Northern Thai
55. Nyaheun
56. O’du
    
57. Oi
58. Paza
    
59. Phana’
60. Phong
61. Phongku
62. Phongset
63. Phu Thai
64. Phuan
65. Phunoi
66. Phunyot
67. Piyo
68. Prai
69. Saek
70. Sapuan
71. Sedang
72. Sila
73. Sinsali
74. Southwestern Mandarin
75. Su'
76. Ta’Oi
77. Tai Dam
78. Tai Lü
79. Tai Yo
80. Tay Khang
81. Thavung
82. Vietnamese
    
83. Yoy
    
84. An unknown number of indigenous sign languages