Countries that are confirmed so far as of 22/05/08 are:
CHN (China) host nation
GER (Germany) the gold medalist from the EuroHockey Nations Championship
ARG (Argentina) the gold medalist from the Pan American Games
RSA (South Africa) the gold medalist from the Africa Women's Olympic Qualifying Tournament
NED (Netherlands) the silver medalist from the EuroHockey Nations Championship
GBR (Great Britain) the bronze medalist from the EuroHockey Nations Championship
NZL (New Zealand) the gold medalist from the Oceania Cup
AUS (Australia) the silver medalist from the Oceania Cup
JPN (Japan)
CHN (China) host nation
NED (Netherlands) the gold medalist from the EuroHockey Nations Championship
KOR (South Korea) the gold medalist from the Asian Games
CAN (Canada) the gold medalist from the Pan American Games
RSA (South Africa) the gold medalist from the Africa Men's Olympic Qualifying Tournament
ESP (Spain) the silver medalist from the EuroHockey Nations Championship
BEL (Belgium) the bronze medalist from the EuroHockey Nations Championship
PAK (Pakistan) the bronze medalist from the Asian Games
AUS (Australia) the gold medalist from the Oceania Cup
NZL (New Zealand) the gold medalist from the first Olympic qualification
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* Afghanistan * Albania * Algeria * American Samoa * Andorra * Angola * Antigua and Barbuda * Argentina * Armenia * Aruba * Australia * Austria * Azerbahjin * Bahamas * Bahrain * Bangladesh * Barbados * Belarus * Belgium * Belize * Benin * Bermuda * Bhutan * Bolivia * Bosnia and Herzegovina * Botswana * Brazil * British Virgin Islands * Brunei * Bulgaria * Burkina Faso * Burundi * Cambodia * Cameroon * Canada * Cape Verde * Cayman Islands * Central African Republic * Chad * Chile * China * Colombia * Comoros * Congo * Cook Islands * Costa Rica * Cote d'Ivoire * Croatia * Cuba * Cyprus * Czech Republic * Democratic Republic of the Congo * Denmark * Djibouti * Dominica * Dominican Republic * Ecuador * Egypt * El Salvador * Equatorial Guinea * Eritrea * Estonia * Ethiopia * Fiji * Finland * France * Gabon * Gambia * Georgia * Germany * Ghana * Great Britain * Greece * Grenada * Guam * Guatemala * Guinea * Guinea-Bissau * Guyana * Haiti * Honduras * Hong Kong * Hungary * Iceland * India * Indonesia * Iran * Iraq * Ireland * Israel * Italy * Jamaica * Japan * Jordan * Kazakhstan * Kenya * Kiribati * Kuwait * Kyrgyzstan * Laos * Latvia * Lebanon * Lesotho * Liberia * Libya * Liechtenstein * Lithuania * Luxembourg * Macedonia * Madagascar * Malawi * Malaysia * Maldives * Mali * Malta * Marshall Islands * Mauritania * Mauritius * Mexico * Micronesia * Moldova * Monaco * Mongolia * Montenegro * Morocco * Mozambique * Myanmar * Namibia * Nauru * Nepal * Netherlands * Netherlands Antilles * New Zealand * Nicaragua * Niger * Nigeria * North Korea * Norway * Oman * Pakistan * Palau * Palestine * Panama * Papua New Guinea * Paraguay * Peru * Philippines * Poland * Portugal * Puerto Rico * Qatar * Romania * Russia * Rwanda * Saint Kitts and Nevis * Saint Lucia * Saint Vincent and the Grenadines * Samoa * San Marino * Sao Tome and Principe * Saudi Arabia * Senegal * Serbia * Seychelles * Sierra Leone * Singapore * Slovakia * Slovenia * Solomon Islands * Somalia * South Africa * South Korea * Spain * Sri Lanka * Sudan * Suriname * Swaziland * Sweden * Switzerland * Syria * Taiwan * Tajikistan * Tanzania * Thailand * Timor-Leste * Togo * Tonga * Trinidad and Tobago * Tunisia * Turkey * Turkmenistan * Tuvalu * Uganda * Ukraine * United Arab Emirates * United States * Uruguay * Uzbekistan * Vanuatu * Venezuela * Vietnam * Virgin Islands * Yemen * Zambia * Zimbabwe * Afghanistan * Albania * Algeria * American Samoa * Andorra * Angola * Antigua and Barbuda * Argentina * Armenia * Aruba * Australia * Austria * Azerbahjin * Bahamas * Bahrain * Bangladesh * Barbados * Belarus * Belgium * Belize * Benin * Bermuda * Bhutan * Bolivia * Bosnia and Herzegovina * Botswana * Brazil * British Virgin Islands * Brunei * Bulgaria * Burkina Faso * Burundi * Cambodia * Cameroon * Canada * Cape Verde * Cayman Islands * Central African Republic * Chad * Chile * China * Colombia * Comoros * Congo * Cook Islands * Costa Rica * Cote d'Ivoire * Croatia * Cuba * Cyprus * Czech Republic * Democratic Republic of the Congo * Denmark * Djibouti * Dominica * Dominican Republic * Ecuador * Egypt * El Salvador * Equatorial Guinea * Eritrea * Estonia * Ethiopia * Fiji * Finland * France * Gabon * Gambia * Georgia * Germany * Ghana * Great Britain * Greece * Grenada * Guam * Guatemala * Guinea * Guinea-Bissau * Guyana * Haiti * Honduras * Hong Kong * Hungary * Iceland * India * Indonesia * Iran * Iraq * Ireland * Israel * Italy * Jamaica * Japan * Jordan * Kazakhstan * Kenya * Kiribati * Kuwait * Kyrgyzstan * Laos * Latvia * Lebanon * Lesotho * Liberia * Libya * Liechtenstein * Lithuania * Luxembourg * Macedonia * Madagascar * Malawi * Malaysia * Maldives * Mali * Malta * Marshall Islands * Mauritania * Mauritius * Mexico * Micronesia * Moldova * Monaco * Mongolia * Montenegro * Morocco * Mozambique * Myanmar * Namibia * Nauru * Nepal * Netherlands * Netherlands Antilles * New Zealand * Nicaragua * Niger * Nigeria * North Korea * Norway * Oman * Pakistan * Palau * Palestine * Panama * Papua New Guinea * Paraguay * Peru * Philippines * Poland * Portugal * Puerto Rico * Qatar * Romania * Russia * Rwanda * Saint Kitts and Nevis * Saint Lucia * Saint Vincent and the Grenadines * Samoa * San Marino * Sao Tome and Principe * Saudi Arabia * Senegal * Serbia * Seychelles * Sierra Leone * Singapore * Slovakia * Slovenia * Solomon Islands * Somalia * South Africa * South Korea * Spain * Sri Lanka * Sudan * Suriname * Swaziland * Sweden * Switzerland * Syria * Taiwan * Tajikistan * Tanzania * Thailand * Timor-Leste * Togo * Tonga * Trinidad and Tobago * Tunisia * Turkey * Turkmenistan * Tuvalu * Uganda * Ukraine * United Arab Emirates * United States * Uruguay * Uzbekistan * Vanuatu * Venezuela * Vietnam * Virgin Islands * Yemen * Zambia * Zimbabwe
205 nations competed at the 2008 Olympics:
1. • Afghanistan (4)
2. • Albania (11)
3. • Algeria (8)
4. • American Samoa (4)
5. • Andorra (5)
6. • Angola (26)
7. • Antigua and Barbuda
8. • Argentina (138)
9. • Armenia (25)
10. • Aruba (2)
11. • Australia (433)
12. • Austria (72)
13. • Azerbaijan (39)
14. • Bahamas (19)
15. • Bahrain (11)
16. • Bangladesh (5)
17. • Barbados (8)
18. • Belarus (208)
19. • Belgium (94)
20. • Belize (3)
21. • Benin (3)
22. • Bermuda (6)
23. • Bhutan (2)
24. • Bolivia (6)
25. • Bosnia and Herzegovina (5)
26. • Botswana (2)
27. • Brazil (277)
28. • British Virgin Islands (2)
29. • Brunei (2)
30. • Bulgaria (72)
31. • Burkina Faso (4)
32. • Burundi (3)
33. • Cambodia (6)
34. • Cameroon (3)
35. • Canada (331)
36. • Cape Verde (3)
37. • Cayman Islands (3)
38. • Central African Republic (3)
39. • Chad (2)
40. • Chile (27)
41. • China (639)
42. • Chinese Taipei (80)
43. • Colombia (64)
44. • Comoros (3)
45. • DR Congo (2)
46. • Congo (3)
47. • Cook Islands (4)
48. • Costa Rica (6)
49. • Côte d'Ivoire
50. • Croatia (106)
51. • Cuba (149)
52. • Cyprus (17)
53. • Czech Republic (130)
54. • Denmark (83)
55. • Djibouti (4)
56. • Dominica
57. • Dominican Republic (23)
58. • Ecuador (25)
59. • Egypt (103)
60. • El Salvador (11)
61. • Equatorial Guinea (3)
62. • Eritrea (11)
63. • Estonia (47)
64. • Ethiopia (36)
65. • Fiji (6)
66. • Finland (55)
67. • France (323)
68. • FS Micronesia
69. • FYR Macedonia (7)
70. • Gabon (4)
71. • Gambia (3)
72. • Georgia (35)
73. • Germany (439)
74. • Ghana (9)
75. • Great Britain (313)
76. • Greece (159)
77. • Grenada (1)
78. • Guam (5)
79. • Guatemala (12)
80. • Guinea (1)
81. • Guinea-Bissau (3)
82. • Guyana (4)
83. • Haiti (1)
84. • Honduras (25)
85. • Hong Kong, China (34)
86. • Hungary (171)
87. • Iceland (26)
88. • India (57)
89. • Indonesia (24)
90. • Iran (55)
91. • Iraq (2)
92. • Ireland (54)
93. • Israel (43)
94. • Italy (344)
95. • Jamaica (56)
96. • Japan (351)
97. • Jordan (7)
98. • Kazakhstan (132)
99. • Kenya (56)
100. • Kiribati (3)
101. • South Korea (267)
102. • North Korea (63)
103. • Kuwait (6)
104. • Kyrgyzstan (21)
105. • Laos (4)
106. • Latvia (49)
107. • Lebanon (5)
108. • Lesotho (4)
109. • Liberia (3)
110. • Libya (7)
111. • Liechtenstein (2)
112. • Lithuania (69)
113. • Luxembourg (12)
114. • Madagascar (4)
115. • Malawi (4)
116. • Malaysia (27)
117. • Maldives (4)
118. • Mali (12)
119. • Malta (6)
120. • Marshall Islands (5)
121. • Mauritania (2)
122. • Mauritius (3)
123. • Mexico (85)
124. • Moldova (31)
125. • Monaco (2)
126. • Mongolia (29)
127. • Montenegro (17)
128. • Morocco (49)
129. • Mozambique (6)
130. • Myanmar (6)
131. • Namibia (9)
132. • Nauru (1)
133. • Nepal (7)
134. • Netherlands (245)
135. • Netherlands Antilles (3)
136. • New Zealand (182)
137. • Nicaragua (6)
138. • Niger
139. • Nigeria (33)
140. • Norway (85)
141. • Oman (4)
142. • Pakistan (21)
143. • Palau (4)
144. • Palestine (4)
145. • Panama (3)
146. • Papua New Guinea (7)
147. • Paraguay (5)
148. • Peru (12)
149. • Philippines (15)
150. • Poland (268)
151. • Portugal (78)
152. • Puerto Rico (22)
153. • Qatar (22)
154. • Romania (102)
155. • Russia (467)
156. • Rwanda (4)
157. • Saint Kitts and Nevis
158. • Saint Lucia
159. • Saint Vincent and the Grenadines
160. • São Tomé and Príncipe (3)
161. • Samoa (6)
162. • San Marino (4)
163. • Saudi Arabia (16)
164. • Senegal (8)
165. • Serbia (92)
166. • Seychelles (8)
167. • Sierra Leone (2)
168. • Singapore (25)
169. • Slovakia (57)
170. • Slovenia (62)
171. • Solomon Islands (3)
172. • Somalia (2)
173. • South Africa (136)
174. • Spain (287)
175. • Sri Lanka (8)
176. • Sudan (9)
177. • Suriname (4)
178. • Swaziland (4)
179. • Sweden (97)
180. • Switzerland (83)
181. • Syria (7)
182. • Tajikistan (13)
183. • Tanzania
184. • Thailand (25)
185. • Timor-Leste (2)
186. • Togo (1)
187. • Tonga (3)
188. • Trinidad and Tobago (28)
189. • Tunisia (32)
190. • Turkey (68)
191. • Turkmenistan (10)
192. • Tuvalu (3)
193. • Uganda (11)
194. • Ukraine (254)[87]
195. • United Arab Emirates (5)
196. • United States (596)
197. • Uruguay (12)
198. • Uzbekistan (58)
199. • Vanuatu (3)
200. • Venezuela (109)
201. • Vietnam (21)
202. • Virgin Islands (5)
203. • Yemen (5)
204. • Zambia (7)
205. • Zimbabwe (13)
In brackets is the number of athletes that competed from each country.
hope this helps :)