Chicken Soup for the Soul: https://www.chickensoup.com/story-submissions/possible-book-topics
This is one company I have experience with and will continue to recommend. They always have a call out for multiple topics. They also pay fairly well in both cash and contributor copies. If you are interested in writing creative nonfiction, please check out the link above.
The First Line: https://www.thefirstline.com/
Accepting fiction, nonfiction, and poetry, the next available deadlines are May 1, August 1, and November 1. Please click the link above to learn more.
FLASH 500 COMPETITION: http://www.flash500.com/This is an annual set of three competitions for 500 words or less - in the categories of flash fiction, short story, and novel opening!
This quarterly open-themed competition has closing dates of March 31, June 30, September 30 and December 31. The results will be announced within six weeks of each closing date and the three winning entries each quarter will be published on this website. Entry fee: £5 for one story, £8 for two stories. Optional critiques: £15 per story. The competition is open to anyone over the age of 18, including non-UK entrants. Only manuscripts which are within the 500-word limit will be accepted. Entries must be in English.
Prizes will be awarded as follows:
Highly commended: A copy of The Writer’s ABC Checklist
*DEADLINE EXTENDED TO 14TH MAY 2021*
We no longer accept unsolicited manuscripts, but we do offer unpublished and unagented writers of children's fiction the chance to submit their work to the annual Times/Chicken House Children's Fiction Competition. We're looking for original ideas, a fresh voice, a diverse range of entries and stories that children will love! We'd particularly like to encourage entry for BAME writers and others from underrepresented backgrounds. The competition will close for entries on 14 May 2021 at 11.59pm GMT.
The Times/Chicken House Prize is a worldwide publishing contract with Chicken House with a royalty advance of £10,000, plus an offer of representation from a top literary agent. This year we're delighted to introduce an exciting new prize, sponsored by the Institution of Engineering and Technology (IET), who are celebrating their 150th anniversary in 2021. The IET 150 Award will be awarded to a complete fiction manuscript for children aged 7 up to Young Adult that broadly explores or celebrates Science, Technology, Engineering and Maths.
By entering the competition, your manuscript will automatically be considered for both prizes by our expert team of readers. To enter, you must have written a completed full-length novel suitable for children/young adults aged somewhere between 7 and 18 years. By full-length we suggest a minimum of 30,000 words and ask that manuscripts entered do not exceed 80,000 words in length (please note these are suggested word counts). Visit the site above for more info...
The Vancouver Writers Fest's annual youth writing contest is open to all students enrolled in grades 8-12 in British Columbia. Entries will be accepted for previously unpublished short stories (fiction or non-fiction) and personal essays: 1,500 word limit. The first-prize winner will receive a $200 cash prize and the second-prize winner, a $100 cash prize. Deadline May 31.
For More Options: https://blog.reedsy.com/writing-contests/