Not really. Miss Marple had several friends who would acompany her sometimes or be referred to, but she didn't have a Watson or a Hastings.
There is no exact explaination as to why, but maybe this quote from Agatha Christie about Miss Marple will help:
" There was no unkindness in Miss Marple, she just did not trust people. Though she expected the worst, she often accepted people kindly in spite of what they were."
It is probale that although we all know that Miss Marple is compassionate and able to see good in people, that this inate distrust (possibly from an event in her past, maybe similar to Agatha Christie's herself) for others makes one trusty companion who would acompany her on each adventure impossible.
Miss Jane Marple
miss marple lives in St Mary Mead
Miss Marple's Christian name is Jane.
Agatha Christie wrote the Miss. Marple stories.
Miss Marple - TV series - was created on 1984-12-26.
Miss Marple's first name is Jane.
Miss Marple - TV series - ended on 1992-12-27.
Miss Marple was a character, not a book. She first appeared in a story called "The Tuesday Night Club", published in a magazine in 1926. The first Miss Marple novel was Murder at the Vicarage, published first in 1930.
Miss Jane Marple lives in the village of St. Mary Mead.
Margaret Rutherford played Miss Marple in the 1963 film "Murder at the Gallop."
Miss Marple
Agatha Christie