Sonnet 21 is one of 154 sonnets written by the English playwright and poet William Shakespeare and is part of the Fair Youth sequence. Like Sonnet 130, it addresses the issue of truth in love, as the speaker asserts that his lines, while less extravagant than those of other poets, are more truthful. Contrary to most of Shakespeare's sonnets, Sonnet 21 is not addressed to any one person. There is no second person, no overt "you" or "thou" expressed in it.

Sonnet 20 is one of the best-known of 154 sonnets written by the English playwright and poet William Shakespeare. Part of the Fair Youth sequence, the subject of the sonnet is widely interpreted as being male, thereby raising questions about the sexuality of its author. In this sonnet the beloved's beauty is compared to both a man's and a woman's.