| Wallemia ichthyophaga | 111179 |
| Wallemia sebi | 4438, 4439, 4440, 5992, 5993, 6668, 9644, 32277, 109521, 112076 |
| Wandonia haliotis | 105642T |
| Warcupia terrestris | 9723, 31799T, 109849 |
| Warcupiella spinulosa | 31800T, 32023T |
| Wardomyces anomalus | 8284, 8907, 31980, 33054 |
| Wardomyces columbinus | 33055 |
| Wardomyces humicola | 32094, 33056 |
| Wardomyces inflatus | 30558, 31981, 32278 |
| Wardomyces pulvinatus | 8908 |
| Wardomyces simplex | 8909T |
| Watanabea (class: Trebouxiophyceae) | 113312 |
| Weeksella virosa | 16016T |
| Weissella cibaria | 106073T |
| Weissella confusa | 3955, 3957, 3958, 106469T |
| Weissella cryptocerci | 113066T |
| Weissella hellenica | 15553T |
| Weissella muntiaci | 113537T |
| Weissella paramesenteroides | 109620T |
| Weissella soli | 106074T |
| Weissella sp. | 106001, 106006, 106008, 106021, 106026, 106033, 106043, 107204, 107217, 107219, 107230, 107245, 107272, 108294, 108391, 108464, 108471, 108542, 108543, 112044, 112045 |
| Weissella thailandensis | 109621T |
| Weissella viridescens | 3949 |
| Weizmannia acidilactici | 113028T, 113029 |
| Weizmannia coagulans | 3557, 3886, 3887, 12583T, 12714, 106567, 106568, 112046 |
| Wenyingzhuangia aestuarii | 111505T |
| Wenyingzhuangia gracilariae | 110602T |
| Wenyingzhuangia heitensis | 110601T |
| Westerdykella cylindrica | 9426T |
| Westerdykella dispersa | 8431, 8787, 31220, 31695, 31801T, 100030, 100321 |
| Westerdykella globosa | 32588T, 32630, 32699, 32700 |
| Westerdykella multispora | 5813, 7558, 7894, 7895, 31802T |
| Westerdykella nigra | 9427T, 31803T |
| Westerdykella ornata | 8205T |
| Westerdykella purpurea | 9428T, 31804 |
| Wickerhamia fluorescens | 1116T |
| Wickerhamiella azyma | 115916 |
| Wickerhamiella bidentis | 115686T, 115687 |
| Wickerhamiella domercqiae | 1857T |
| Wickerhamiella hasegawae | 102566T |
| Wickerhamiella kazuoi | 102565T |
| Wickerhamiella siamensis | 109697T |
| Wickerhamiella versatilis | 115872 |
| Wickerhamomyces alni | 10710T, 10711 |
| Wickerhamomyces anomalus | 0118, 0119, 0120, 0121, 0122, 0127, 0130, 0135, 0136, 0139, 0140, 0141, 0144, 0145, 0146, 0147, 0148, 0149, 0568, 0569, 0707, 0806, 0963, 1150, 1181, 1760, 1761, 10213T, 100263, 100264, 100265, 100266, 100267, 100268, 100269, 100270, 100271, 100272, 103856, 105132, 105133, 105135, 110346, 110349, 114548 |
| Wickerhamomyces bisporus | 0803T |
| Wickerhamomyces bovis | 0872 |
| Wickerhamomyces canadensis | 0973T, 0976, 0977, 0978, 0979 |
| Wickerhamomyces chambardii | 1029, 1274T |
| Wickerhamomyces ciferrii | 0793T, 0905, 0994 |
| Wickerhamomyces edaphicus | 101969T |
| Wickerhamomyces hampshirensis | 10719T |
| Wickerhamomyces lynferdii | 10724T |
| Wickerhamomyces mucosa | 1825T |
| Wickerhamomyces onychis | 1682T |
| Wickerhamomyces pijperi | 1290T, 1791, 1887, 102058, 102059, 102060, 102061 |
| Wickerhamomyces psychrolipolyticus | 113263T, 113264 |
| Wickerhamomyces rabaulensis | 1643T, 111297, 111317 |
| Wickerhamomyces scolytoplatypi | 11029T |
| Wickerhamomyces siamensis | 108900T |
| Wickerhamomyces silvicola | 0807T, 1383, 1481 |
| Wickerhamomyces sp. | 110195, 110196 |
| Wickerhamomyces strasburgensis | 1027, 1273T, 11035, 11037 |
| Wickerhamomyces subpelliculosa | 0198, 0808T, 10109, 10666 |
| Wickerhamomyces sydowiorum | 1705T, 10954 |
| Wickerhamomyces tratensis | 107799T |
| Wickerhamomyces xylosica | 108869T |
| Wickerhamomyces xylosivorus | 111553T |
| Wiesneriomyces javanicus | 9053, 100231 |
| Wilhelminamyces savonicus | 10309T |
| Wilhelminamyces tanticharoeniae | 105895T |
| Williamsia muralis | 105860T, 112439 |
| Williamsia sp. | 102193 |
| Williopsis californica | 0800T, 1468, 1469, 1764, 1765, 1766, 1771, 1880, 1881, 1882, 100658, 100659, 105160 |
| Williopsis salicorniae | 10733T |
| Winogradskya consettensis | 14913T |
| Winogradskya humida | 14915T |
| Winogradskyella crassostreae | 110924T |
| Winogradskyella psychrotolerans | 106169T |
| Winogradskyella sp. | 107664, 107665 |
| Wolfiporia cocos | 30268, 100243 |
