The AMS has four mid-December fellowship deadlines. 

AHJ AMS 50 Dissertation-Year Fellowship 
Howard Mayer Brown Fellowship for minority graduate study
Holmes/D'Accone Fellowship in opera studies
(all with deadlines 17 December)

and jointly with the Newberry Library:

AMS-Newberry Library Short-Term Fellowship (deadline 15 December)

See the respective web pages for full details and application forms. 

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