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NBA乐透抽签是一个NBA选秀重要的一部分，该选秀由国家篮球协会（简称NBA）举行。
NBA乐透抽签是给予未能晋级季后赛队伍的，以确定NBA选秀的选秀顺序。
从2019年选秀开始，NBA将改变状元签机率（最低的三支球队为14％的机会赢得状元签），并将抽签中选定的球队数量从三个增加到四个。
乐透抽签通常在5月第三或第四的星期进行。
以下为2005至2018年间的情形，16支球队晋级季后赛，剩下14支球队没有晋级季后赛的队伍排名由最差至最佳如下：
- 250个组合，25.0％的机率获得状元签
- 199组合，有19.9％的机率
- 156种组合，15.6％的机率
- 119个组合，11.9％的机率
- 88种组合，8.8％的机率
- 63种组合，6.3％的机率
- 43种组合，4.3％的机率
- 28种组合，2.8％的机率
- 17种组合，1.7％的机率
- 11种组合，1.1％机率
- 8种组合，0.8％机率
- 7种组合，0.7％机率
- 6种组合，0.6％机率
- 5种组合，0.5％的机率
| 种子顺位 | 机率 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 1 | 250 | .250 | .215 | .178 | .357 | – | – | – | – | – | – | – | – | – | – |
| 2 | 199 | .199 | .188 | .171 | .319 | .123 | – | – | – | – | – | – | – | – | – |
| 3 | 156 | .156 | .157 | .156 | .226 | .265 | .040 | – | – | – | – | – | – | – | – |
| 4 | 119 | .119 | .126 | .133 | .099 | .351 | .160 | .012 | – | – | – | – | – | – | – |
| 5 | 88 | .088 | .097 | .107 | – | .261 | .360 | .084 | .004 | – | – | – | – | – | – |
| 6 | 63 | .063 | .071 | .081 | – | – | .439 | .305 | .040 | .001 | – | – | – | – | – |
| 7 | 43 | .043 | .049 | .058 | – | – | – | .599 | .232 | .018 | .000 | – | – | – | – |
| 8 | 28 | .028 | .033 | .039 | – | – | – | – | .724 | .168 | .008 | .000 | – | – | – |
| 9 | 17 | .017 | .020 | .024 | – | – | – | – | – | .813 | .122 | .004 | .000 | – | – |
| 10 | 11 | .011 | .013 | .016 | – | – | – | – | – | – | .870 | .089 | .002 | .000 | – |
| 11 | 8 | .008 | .009 | .012 | – | – | – | – | – | – | – | .907 | .063 | .001 | .000 |
| 12 | 7 | .007 | .008 | .010 | – | – | – | – | – | – | – | – | .935 | .039 | .000 |
| 13 | 6 | .006 | .007 | .009 | – | – | – | – | – | – | – | – | – | .960 | .018 |
| 14 | 5 | .005 | .006 | .007 | – | – | – | – | – | – | – | – | – | – | .982 |
自2019年起，乐透抽签改为以下情形：
前三位有14%的机会获得状元签。
- 140个组合，获得状元签的机率为14.0％
- 140种组合，14.0％的机率
- 140种组合，14.0％的机率
- 125个组合，12.5％的机率
- 105种组合，10.5％的机率
- 90种组合，9.0％的机率
- 75个组合，7.5％的机率
- 60种组合，6.0％的机率
- 45种组合，4.5％的机率
- 30种组合，3.0％机率
- 20种组合，2.0％机率
- 15种组合，1.5％的机率
- 10种组合，1.0％机率
- 5种组合，0.5％的机率
| 种子顺位 | 机率 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
| 1 | 140 | .140 | .134 | .127 | .120 | .479 | – | – | – | – | – | – | – | – | – |
| 2 | 140 | .140 | .134 | .127 | .120 | .278 | .200 | – | – | – | – | – | – | – | – |
| 3 | 140 | .140 | .134 | .127 | .120 | .148 | .260 | .070 | – | – | – | – | – | – | – |
| 4 | 125 | .125 | .122 | .119 | .115 | .072 | .257 | .167 | .022 | – | – | – | – | – | – |
| 5 | 105 | .105 | .105 | .106 | .105 | .022 | .196 | .267 | .087 | .006 | – | – | – | – | – |
| 6 | 90 | .090 | .092 | .094 | .096 | – | .086 | .298 | .206 | .037 | .001 | – | – | – | – |
| 7 | 75 | .075 | .078 | .081 | .085 | – | – | .197 | .341 | .129 | .013 | .000 | – | – | – |
| 8 | 60 | .060 | .063 | .067 | .072 | – | – | – | .345 | .321 | .067 | .004 | .000 | – | – |
| 9 | 45 | .045 | .048 | .052 | .057 | – | – | – | – | .507 | .259 | .030 | .001 | .000 | – |
| 10 | 30 | .030 | .033 | .036 | .040 | – | – | – | – | – | .659 | .190 | .012 | .000 | .000 |
| 11 | 20 | .020 | .022 | .024 | .028 | – | – | – | – | – | – | .776 | .126 | .004 | .000 |
| 12 | 15 | .015 | .017 | .019 | .021 | – | – | – | – | – | – | – | .861 | .067 | .001 |
| 13 | 10 | .010 | .011 | .012 | .014 | – | – | – | – | – | – | – | – | .929 | .023 |
| 14 | 5 | .005 | .006 | .006 | .007 | – | – | – | – | – | – | – | – | – | .976 |
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