TNK

The initials TNK may refer to:
 * Tenecteplase (TNK) - an enzyme used as a thrombolytic drug
 * TNK-BP Ltd. - a Russian oil company
 * The Japanese animation studio TNK
 * TNK - a Turkish band
 * The Beatles song Tomorrow Never Knows
 * TN Krishnan, Indian violinist
 * Tanakh - the Hebrew Bible
 * Tin King stop - a Light Rail stop in Hong Kong