The Wergle Flomp Poetry Contest is open to writers around the world, is completely free to enter, and offers $2,250 in cash prizes.
Contestants can enter one humor poem, up to 250 lines.
According to the contest page:
Submit one humor poem, up to 250 lines. First prize of $1,000 plus a one-year gift certificate from our co-sponsor, Duotrope (a $50 value). Second prize of $250. Ten Honorable Mentions will receive $100 each. The top 12 entries will be published online. There is no fee to enter. Judge: Jendi Reiter, assisted by Lauren Singer Ledoux.
In addition to English, your poem may contain inspired gibberish. You may submit published or unpublished work. Please omit your name from your entries. We prefer 12-point type or larger. Please avoid fancy, hard-to-read fonts.
The contest is run by Winning Writers, which is a website about writing contests; they publish a lot of information about free writing contests. Beware that they also promote fee-based contests.
To learn more about the Wergle Flomp contest, read the contest guidelines.