There are 10 genera of Laughing thrushes in the large family of Timaliidae the Old World Babblers or timaliids. The genera and the 66 species are as follows: (Wikipedia)

Genus Garrulax
White-crested Laughingthrush, Garrulax leucolophus
Sumatran Laughingthrush, Garrulax bicolor
Lesser Necklaced Laughingthrush, Garrulax monileger
Greater Necklaced Laughingthrush, Garrulax pectoralis
White-throated Laughingthrush, Garrulax albogularis
Rufous-crowned Laughingthrush, Garrulax ruficeps
Masked Laughingthrush, Garrulax perspicillatus
Rufous-fronted Laughingthrush, Garrulax rufifrons
Ashy-headed Laughingthrush, Garrulax cinereifrons
Sunda Laughingthrush or Grey-and-brown Laughingbird, Garrulax palliates

Genus Garrulax or Dryonastes?
Grey Laughingthrush, Garrulax/Dryonastes maesi
Rufous-cheeked Laughingthrush, Garrulax/Dryonastes castanotis - formerly in G./D. maesi
Black-hooded Laughingthrush, Garrulax/Dryonastes milleti
Kon Tum Black-hooded Laughingthrush, Garrulax/Dryonastes milleti sweeti
Cambodian Laughingthrush, Garrulax/Dryonastes ferrarius - formerly in G./D. strepitans
White-necked Laughingthrush, Garrulax/Dryonastes strepitans

Proposed genus Dryonastes
Grey-sided Laughingthrush, Dryonastes caerulatus
Rusty Laughingthrush, Dryonastes poecilorhynchus
Buffy Laughingthrush, Dryonastes berthemyi
Black-throated Laughingthrush, Dryonastes chinensis
Chestnut-backed Laughingthrush, Dryonastes nuchalis
Rufous-vented Laughingthrush, Dryonastes gularis
Wynaad Laughingthrush, Dryonastes delesserti
Blue-crowned Laughingthrush or Courtois's Laughingbird, Dryonastes courtoisi
Yellow-throated Laughingthrush, Dryonastes galbanus
White-cheeked Laughingthrush, Dryonastes vassali
Rufous-necked Laughingthrush, Dryonastes ruficollis

Proposed genus Melanocichla
Black Laughingthrush, Melanocichla lugubris
Bare-headed Laughingthrush, Melanocichla calva - formerly in M. lugubris

Proposed genus Rhinocichla - Chestnut-capped Laughingthrushes
Spectacled Laughingthrush, Rhinocichla mitrata
Chestnut-hooded Laughingthrush, Rhinocichla treacheri - formerly in R. mitrata

Proposed genus Grammatoptila
Striated Laughingthrush, Grammatoptila striata

Proposed genus Stactocichla
Spot-breasted Laughingthrush, Stactocichla merulina
Orange-breasted Laughingthrush, Stactocichla annamensis - formerly in S. merulina

Proposed genus Leucodioptron
Chinese Hwamei, Leucodioptron canorum
Taiwan Hwamei, Leucodioptron taewanum - formerly in L. canorum

Proposed genus Strophocincla
Black-chinned Laughingthrush, Rufous-breasted Laughingthrush or Nilgiri Laughingthrush, Strophocincla cachinnans
Kerala Laughingthrush or Grey-breasted Laughingthrush, Strophocincla fairbanki
Bhutan Laughingthrush, Strophocincla imbricata - formerly in S. lineata
Streaked Laughingthrush, Strophocincla lineata
Striped Laughingthrush, Strophocincla virgata

Proposed genus Pterorhinus
White-browed Laughingthrush, Pterorhinus sannio
Plain Laughingthrush, Pere David's Laughingthrush or Plain Laughingbird, Pterorhinus davidi

Proposed genus Ianthocincla - Close to at least one of Garrulax sensu stricto,
Cutia and Arrow-marked Babbler (Turdoides jardineii)
Snowy-cheeked Laughingthrush or Sukatschev's Laughingthrush, Ianthocincla sukatschewi
Moustached Laughingthrush, Ianthocincla cineracea
Rufous-chinned Laughingthrush, Ianthocincla rufogularis
Chestnut-eared Laughingthrush, Ianthocincla konkakinhensis
Barred Laughingthrush, Ianthocincla lunulata
White-speckled Laughingthrush or Biet's Laughingthrush, Ianthocincla bieti
Giant Laughingthrush, Ianthocincla maxima
Spotted Laughingthrush, Ianthocincla ocellata

Genus - Ianthocincla or Trochalopteron?
Brown-capped Laughingthrush,Trochalopteron/Ianthocincla austeni

Proposed genus Trochalopteron
Scaly Laughingthrush, Trochalopteron subunicolor
Blue-winged Laughingthrush, Trochalopteron squamatum
Brown-cheeked Laughingthrush or Prince Henry's Laughingthrush, Trochalopteron henrici
Elliot's Laughingthrush, Trochalopteron elliotii
Variegated Laughingthrush, Trochalopteron variegatum
White-whiskered Laughingthrush, Trochalopteron morrisonianum
Black-faced Laughingthrush, Trochalopteron affine
Chestnut-crowned Laughingthrush, Trochalopteron erythrocephalum
Assam Laughingthrush, Trochalopteron chrysopterum - formerly in T. erythrocephalum
Silver-eared Laughingthrush, Trochalopteron melanostigma - formerly in T. erythrocephalum
Malayan Laughingthrush, Trochalopteron peninsulae - formerly in T. erythrocephalum
Golden-winged Laughingthrush, Trochalopteron ngoclinhense
Collared Laughingthrush, Trochalopteron yersini
Red-winged Laughingthrush, Trochalopteron formosum
Red-tailed Laughingthrush, Trochalopteron milneiå