National Blog Posting Month, or NaBloPoMo, is a month long writing exercise intended to occur annually in November. The first NaBloPoMo occurred in November of 2006, and was the brainchild of M. Kennedy, an American blogger. Kennedy was inspired by National Novel Writing Month (NaNoWriMo), which also happens every November, and thought that there should be a blogging counterpart. NaBloPoMo took off, thanks to the extensive information distribution network between bloggers, with hundreds of participants entered in the first NaBloPoMo.

NaNoWriMo was founded in 1999 by 21 authors in the San Francisco Bay Area who wanted to motivate themselves into producing more written work. The challenge requires authors to produce a 50,000 word novel within one month. Numerous other artists followed suit, with offshoots ranging from challenges which require participants to post a photograph of a new shoe every day to National Blog Posting Month.

The rules of NaBloPoMo are simple, although the challenge is set up on an honor system. Participants are required to publish one post on their personal website or blog every day. There is no length requirement, with some posters writing long essays every day and others posting photographs and brief captions. Participants are not permitted to back post or schedule chron jobs to upload posts in the future, but must actively create a post every day for the month of November.

Because the challenge is in many ways unenforceable, participants are relying on each other's honor, and assuming that other participants will not cheat. NaBloPoMo does include a consolation prize for the blogger with the best tragic tale about why he or she was unable to complete the challenge. Extenuating circumstances such as fire, evacuation, or medical emergency would be required.

In some ways, NaBloPoMo is more challenging than NaNoWriMo, because NaBloPoMo participants cannot take days off or extensively modify their writing schedules: they must generate new material every day for thirty days. As a result, the attrition rate in the challenge is very high, with many participants dropping out in the first week of NaBloPoMo.

NaBloPoMo also comes with prizes, most of which are from members of the blogging community. In the inaugural year, prizes included a hand knitted scarf, German chocolates, art, jars of jelly, psychic reading, and a variety of other creative contributions. The grand prize was a year of free hosting, along with installation of Word Press, a popular blogging software.